
266 S.W.3d 149 (2008)
Pifi CONSTANCIO, Individually and on behalf of The Estate of Ruben Constancio, Deceased, Appellant
v.
James BRAY, M.D., Appellee.
No. 03-06-00583-CV.
Court of Appeals of Texas, Austin.
September 5, 2008.
*153 Jay Harvey, Winckler & Harvey, L.L.P., Austin, TX, for appellant.
Dana D. Banks, Smith, Rose, Finley, Harp & Price, P.C., San Angelo, TX, for appellee.
Before Justices PATTERSON, PEMBERTON and WALDROP.

OPINION
G. ALAN WALDROP, Justice.
Pifi Constancio, individually and on behalf of the estate of Ruben Constancio, deceased, appeals the district court's dismissal of her medical malpractice claims against Dr. James Bray for failure to serve an expert report as required by chapter 74 of the civil practice and remedies code. See Tex. Civ. Prac. & Rem.Code Ann. § 74.351 (West Supp.2008). Constancio raises two issues on appeal: (1) the district court abused its discretion in dismissing her claims because the expert report she served was adequate under chapter 74, and (2) although the district court granted her an extension to amend the expert report to cure deficiencies, the court abused its discretion by only granting her a 7-day extension of the 120-day deadline for serving an expert report rather than the statutorily required 30-day extension period.
We conclude that the expert report in question is deficient and affirm the district court's finding on that issue. However, we also conclude that the district court erred in granting Constancio an extension to cure the deficiencies in her expert report that did not conform with the requirements of section 74.351. Although we affirm the district court's finding that Constancio's expert report at issue at the time of the hearing on the motion to dismiss does not satisfy the requirements of section 74.351, the defect is such that it may be curable.[1] It appears from the record that the district court may have intended to exercise its discretion to grant Constancio the full relief available under the statute with respect to an extension to cure pursuant to section 74.351(c). In light of our opinion that the manner in which the district court granted the extension in this cause did not conform to the statute, we reverse the order of dismissal and remand this cause for the district court to consider in its discretionwhether to grant Constancio an extension that complies with section 74.351(c) for the purpose of curing the deficiency in her expert report.

Factual and Procedural Background
In December 2003, Constancio's husband, Ruben, died of cardiorespiratory arrest at Shannon West Texas Memorial Hospital. He had been under the care of Dr. James Bray. On February 3, 2006, Constancio sued Dr. Bray for alleged medical negligence in his care and treatment of Ruben.[2] Her original petition alleged that Dr. Bray was negligent in the following respects: "(a) ordering Ativan, morphine and Phenergan to be administered to Ruben Constancio, ... in [the] face of respiratory distress; (b) not coming in to evaluate *154 the patient in [the] face of respiratory distress and deterioration; (c) decreasing the frequency of nursing assessments and vital sign checks in the face of patient's deterioration and respiratory distress."
On the same day she filed her original petitionFebruary 3, 2006Constancio filed and served the expert report and curriculum vitae of Dr. Steven Hata pursuant to section 74.351 of the civil practice and remedies code setting forth Dr. Hata's opinions regarding Ruben's treatment. Dr. Bray filed a motion objecting to the adequacy of this expert report on February 22, 2006, claiming that "Dr. Hata's report fails to set forth Mr. Constancio's symptoms and conditions, what the standard of care called for Dr. Bray to do in treating those specific symptoms and conditions, that the applicable standard of care was breached by Dr. Bray in his treatment of Mr. Constancio and that same caused Mr. Constancio's death." In response, Constancio claimed that the report was sufficient as written and, in the alternative, requested that the district court grant her "a thirty (30) day extension of the 120-day deadline" in the event the court found the expert report deficient.
On May 10, 2006, 96 days after the original petition was filed, the district court held a hearing on the adequacy of the expert report and found that it was deficient as to causation and the standard of care. At the end of the hearing, the district court announced that it would grant an extension under section 74.351(c) and Constancio would have 30 days from the date of the hearing, or until June 10, 2006, to cure the deficiencies in the expert report. The district court entered an order reflecting this ruling on May 15, 2006.
On May 26, 2006, 112 days after the filing of the original petition, Constancio filed and served an amended expert report and curriculum vitae of Dr. Steven Hata setting forth Dr. Hata's opinions regarding Ruben's treatment. Dr. Bray filed a motion to dismiss Constancio's claims on June 8, 2006, arguing that "the report still fails to identify the standard of care applicable to James Bray, M.D. in treating the decedent, Ruben Constancio and how any breach of the standard of care by James Bray, M.D. in treating the decedent, ... proximately caused the death of Ruben Constancio." Constancio responded that the report was sufficient as written and, in the alternative, requested that the court give her an "extension until thirty days from June 2, 2006, as provided by 74.351(c)."[3] After conducting a hearing on the motion to dismiss on June 14, 2006131 days from the filing of the original petitionthe district court sent a letter to the parties announcing that he intended to grant Dr. Bray's motion to dismiss because the amended expert report "fails to provide an adequate causational connection between the alleged standard of care, the alleged breach thereof, and the death of Mr. Constancio."
On August 10, 2006, Constancio requested an "additional twenty-three days, or until August 19, 2006, to file an expert report" on the basis that the original extension granted by the district court did not conform to statutory requirement of allowing a full 30 days of extension. This request for additional time was denied by the district court on August 10, 2006. *155 Nevertheless, on August 17, 2006, Constancio filed and served a second amended report and curriculum vitae of Dr. Steven Hata setting forth his opinions regarding Ruben's treatment. On August 18, 2006, the district court entered an order dismissing Constancio's claims against Dr. Bray with prejudice and once again denied Constancio's request for the previous extension to be expanded to a full 30 days. The district court's order of dismissal stated that the first amended report "fails to set forth that any failure to meet the standard of care by Dr. James Bray in his treatment of the decedent, Ruben Constancio, caused Ruben Constancio's death." The court also awarded $5,000 in attorneys' fees to Dr. Bray. The district court did not consider or rule on the question of whether the second amended report served on August 17, 2006, was deficient.

Adequacy of the First Amended Expert Report
Section 74.351 of the civil practice and remedies code requires a claimant pursuing a health care liability claim to serve one or more expert reports on each party no later than the 120th day after the filing of the original petition. Id. § 74.351(a). The expert report must provide "a fair summary of the expert's opinions as of the date of the report regarding applicable standards of care, the manner in which the care rendered by the physician or health care provider failed to meet the standards, and the causal relationship between that failure and the injury, harm, or damages claimed." Id. § 74.351(r)(6). A court shall grant a motion challenging the adequacy of a report only if the report "does not represent an objective good faith effort to comply" with the definition of "expert report" in the statute. Id. § 74.351(l). To constitute a good faith effort, the report must provide enough information to fulfill two purposes: (1) it must inform the defendant of the specific conduct the plaintiff has called into question, and (2) it must provide a basis for the district court to conclude that the claims have merit. Bowie Mem'l Hosp. v. Wright, 79 S.W.3d 48, 52 (Tex.2002) (citing American Transitional Care Ctrs., Inc. v. Palacios, 46 S.W.3d 873, 879 (Tex.2001)).
The Texas Supreme Court has also stated that a report need not marshal all of the plaintiff's proof, but it must include the expert's opinion on each of the elements identified in section 74.351. Palacios, 46 S.W.3d at 878. A report cannot merely state the expert's conclusions about the statutory elements. Id. at 879. "Rather, the expert must explain the basis of his statements to link his conclusions to the facts." Bowie Mem'l, 79 S.W.3d at 52 (quoting Earle v. Ratliff, 998 S.W.2d 882, 890 (Tex.1999)). In addition, since the statute focuses on what is required in the report, the only information relevant to determining whether a report complies with the statute is "within the four corners of the document." Palacios, 46 S.W.3d at 878. This requirement precludes a court from filling gaps in a report by drawing inferences or guessing as to what the expert likely meant or intended. Austin Heart P.A., v. Webb, 228 S.W.3d 276, 279 (Tex.App.-Austin 2007, no pet.); see also Bowie Mem'l, 79 S.W.3d at 53 ("The report must include the required information within its four corners."); Gray v. CHCA Bayshore L.P., 189 S.W.3d 855, 859 (Tex. App.-Houston [1st Dist.] 2006, no pet.). There are no "magical words" that an expert must use, such as describing causation in terms of "reasonable medical probability," that determine the adequacy of the report. See Bowie Mem'l, 79 S.W.3d at 53.
We review a trial court's ruling on a motion to dismiss under section 74.351 for an abuse of discretion. Palacios, *156 46 S.W.3d at 877-78. A trial court abuses its discretion when it acts in an arbitrary or unreasonable manner or without reference to any guiding rules or principles. Downer v. Aquamarine Operators, Inc., 701 S.W.2d 238, 241-42 (Tex.1985). A trial court does not abuse its discretion simply because it may decide a matter within its discretion differently than an appellate court. Id. at 242. However, a trial court has no discretion in determining what the law is or applying the law to the facts. Walker v. Packer, 827 S.W.2d 833, 840 (Tex.1992). A clear failure by the trial court to analyze or apply the law correctly will constitute an abuse of discretion. Id.
The district court dismissed Constancio's suit after finding the first amended expert report deficient. The parties do not dispute that the first amended report fairly summarizes the alleged standard of care and how Dr. Bray allegedly breached the standard of care. The parties only contest whether the first amended report constitutes a good faith effort to fairly summarize the causal relationship between Dr. Bray's alleged breach and Ruben's death. Constancio argues that the district court abused its discretion in finding that the first amended report was deficient under section 74.351 because it states Dr. Hata's conclusions regarding causation and links them to specific facts. Dr. Bray responds that the district court did not err in finding the first amended report deficient because it is "conclusory and speculative" on the issue of causation, failing to provide information linking Dr. Bray's alleged breach of the standard of care to Ruben's death.
The four-page first amended report provides Dr. Hata's qualifications, the materials that he reviewed, background facts regarding Ruben's treatment, and sections on the standard of care, Dr. Bray's alleged deviations from the standard of care, and causation. Dr. Hata notes that he reviewed Ruben's medical records and summarizes portions of these records detailing the relevant aspects of Ruben's treatment:
On 12/1/03 at 0040 Mr. Constancio showed tachypnea with a respiratory rate of 32 with bilateral wheezes with a heart rate of 102. No pulse oximetry was reported. His nurse reports that he was agitated at 0145 hours. There was no report of pain, nausea, or anxiety. The nurse [name illegible] injected lorazepam 0.5 mg IV, morphine 2.0 mg IV, and Phenergan 25 mg IV, all at 0145 hours into Mr. Constancio. There are no vital signs written at this time or pulse oximetry. At 0230 hours, Mr. Constancio was reportedly asleep. Mr. Constancio coded at 0340 hours. He required intubation and medical ventilation. He was then admitted to the ICU and treated with broad-spectrum antibiotics. Blood cultures were positive for methicillin resistant Staphylococcus aureus. Chest x-ray showed chest inflitrates suggestive of pulmonary edema. The patient showed no responsiveness after the event. Dr. Chang stated that the findings were consistent anoxic encephalopathy. The patient died on 12/13/03.
Dr. Hata then states that the standard of care for Ruben would have required:
(1) Re-evaluation of the increasingly disoriented patient on 11/30/03 and 12/1/03 by going to the patient's bedside, listen to the lungs with a stethoscope and performing a neurologic examination;
(2) obtain current blood studies of his glucose level to monitor for diabetic ketoacidosis with blood tests;
(3) monitor continuous oxygen saturation levels with the use of pulse oximetry recorded at least every 15 minutes;
(4) increase, rather than decrease, the frequency of monitoring vital signs *157 (blood pressure; pulse; respirations; and blood oxygen saturation);
(5) admit Mr. Constancio to ICU for intensive monitoring;
(6) place Mr. Constancio on supplemental oxygen.
Dr. Hata states that Dr. Bray deviated from the standard of care by failing to:
(1) Re-evaluate Mr. Constancio on 11/30/03 and 12/1/03;
(2) obtain current blood studies of Mr. Constancio's glucose level to monitor for diabetic ketoacidosis;
(3) order continuous oxygen saturation levels with the use of pule oximetry;
(4) order an increase in the frequency of monitoring vital signs (blood pressure; pulse; respirations; and blood oxygen saturation);
(5) admit Mr. Constancio to ICU for intensive monitoring;
(6) place him on supplemental oxygen.
The first amended report concludes with a section entitled "Causation," in which Dr. Hata states, "[h]ad Dr. Bray complied with the standard of care, within reasonable medical probability, Mr. Constancio would not have died when he did." Dr. Hata explains that had Dr. Bray admitted Ruben to the ICU, he would have received constant monitoring and hypoxemia would have "in reasonable medical probability" been recognized by the nurses, who would have alerted Dr. Bray. Dr. Hata opines that if Dr. Bray had then complied with the standard of care and ordered supplemental oxygen or a ventilator, treated the diabetic ketoacidosis by lowering Ruben's blood glucose, and recognized and reversed the combination effects of the medications given, Ruben "would not have died during that hospitalization, and would have, in reasonable medical probability, recovered and been discharged."
After reviewing the first amended report, we conclude that the district court did not abuse its discretion in determining that it does not adequately present a summary of the expert's opinion of the causal relationship between Dr. Bray's alleged failure to meet the applicable standards of care and Ruben's death. The problem with the first amended report is that it fails to show, within its four corners, how increased monitoring and the detection of hypoxemia would have prevented Ruben's death.
As an initial matter, the first amended report fails to adequately explain how Dr. Bray's alleged failure to monitor Ruben's oxygenation status through the use of continuous pulse oximetry led to his death. The first amended report states that "[c]loser evaluation ... would have led Dr. Bray to recognize that Mr. Constancio's agitation was not a response to pain, but a symptom of hypoxemia.... Pulse oximetry at this level in this patient is significantly abnormal and indicates hypoxemia." The report goes on to explain that had Ruben been admitted to the ICU and received constant monitoring, his hypoxic condition would have, in reasonable medical probability, been recognized by the nursing staff and Dr. Bray would have been notified. The report goes on to state that the standard of care would have then required Dr. Bray to put Ruben on supplemental oxygen or a ventilator, treat his diabetic ketoacidosis, and recognize and reverse the combination effects of the medications given. The problem is that there is nothing in the first amended report that explains how any of these steps would have prevented the life-threatening condition that caused Ruben's death.
The first amended report's most significant flaw is that it fails to indicate the condition of which Ruben ultimately died. The first amended report explains that *158 after Ruben "coded" on 12/1/03, "Dr. Chang stated that the findings were consistent with anoxic encephalopathy. The patient died on 12/13/03." However, the report does not explain the cause of the anoxic encephalopathy, nor how, or if, anoxic encephalopathy leads to death. Constancio's argument requires us to assume that Dr. Hata's inclusion of Dr. Chang's diagnosis of anoxic encephalopathy indicates not only that he has adopted Dr. Chang's statement that Ruben had anoxic encephalopathy, but also that he believes that Ruben's untreated hypoxia caused the anoxic encephalopathy and that the anoxic encephalopathy caused Ruben's death. This argument requires us to go outside of the four corners of the amended report and make assumptions to surmise how Ruben died. Without knowing with any certainty what Ruben ultimately died of, we have no indication of the relationship between Dr. Bray's alleged conduct and Ruben's death.
Constancio argues that several cases from other courts of appeals stand for the proposition that a conclusion based on deviation from the standard of care is sufficient to meet the causation requirement of section 74.351. However, these cases are distinguishable from Constancio's case because the report in each expressly identifies the cause of death or specific injury caused by deviation from the standard of care. For example, the report in Bustillos v. Rowley addresses causation by "indicating that if Ms. Arriola had been properly monitored, emergency department personnel could have detected and treated the worsening symptoms of Ms. Arriola's pulmonary edema, the life-threatening condition which was aggravated by the preventable conditions of cardio-vascular collapse and cardiac arrest and cause of her death." 225 S.W.3d 122, 131 (Tex.App.-El Paso 2005, pet. denied) (emphasis added). This report adequately links the expert's conclusions to the facts on the issue of causation because it links the breach of the standard of care to pulmonary edema and cardiac arrhythmia, the expressly identified cause of death. See id. at 130-31.
Similarly, in Gallardo v. Ugarte, a survival and wrongful death action, the report identifies the specific injury and cause of death. See 145 S.W.3d 272, 280 (Tex.App.-El Paso 2004, pet. denied). The portion of the Gallardo report on which Constancio relies discusses decubitus ulcers, which were not the cause of death, but an injury for which the plaintiff sought pain and suffering damages in the survival action. See id. at 278 n. 4, 279-80. The Gallardo report provides ample statements on the cause of this injury. See id. at 279-80. The Gallardo report goes on to address causation with regard to the decedent's congestive heart failure, which is identified as the cause of death. See id. at 280.
Finally, Constancio relies on an unpublished memorandum opinion from the Corpus Christi Court of Appeals to argue that a "failure to treat" allegation with an expert opinion that timely treatment would have prevented injury is adequate. See Tex.R.App. P. 47.1 (regarding citation to unpublished opinions). However, the report at issue in that case satisfies the causation requirement because it ties the statements regarding the failure to monitor and treat to a specific injury. See Salinas v. Gomez, No. 13-05-529-CV, 2006 WL 798934, at *3, 2006 Tex.App. LEXIS 2386, at *8 (Tex.App.-Corpus Christi Mar.30, 2006, no pet.) (mem.op.). The report in Salinas explains:
This failure to monitor and timely refer allowed this patient's head to continue to grow abnormally. The increase in head circumference was a direct result of increased intracranial pressure caused by progressive hydrocephalus. The untreated *159 increased intracranial pressure directly caused brain cell injury and death which proximately caused Isaiah Gomez's permanent disability.
Id. This passage ties the opinion as to the breach of the standard of carethe failure to monitor and treatto a specific injury, brain cell injury and death, that would not have occurred but for the alleged breach of the standard of care.
These cases differ from Constancio's case in the crucial respect that the reports each identify a cause of death or specific injury that would have been prevented had the physician complied with the standard of care. Although Constancio's amended report explains that had Dr. Bray followed the standard of care by continuously monitoring Ruben, his hypoxic condition would have been recognized and Ruben would have been treated with a ventilator or supplemental oxygen, it does not indicate how, or if, hypoxemia ultimately caused Ruben's death. Therefore, Dr. Hata's report does not satisfy the requirement that the alleged breach of the standard of care caused the harm allegedi.e. an opinion that if Ruben's hypoxemia had been treated, whatever condition that caused his death would have been prevented and Ruben would not have died. Consequently, we hold that the district court did not abuse its discretion in concluding that the report was deficient.

Extension of the 120-day Period for Serving an Expert Report
In her second issue, Constancio argues that the district court did not properly apply the cure provisions of section 74.351(c) when granting an extension to cure the deficiencies in her original expert report, resulting in only a 7-day extension of the 120-day deadline for serving expert reports. The record shows that Constancio filed her original petition on February 3, 2006. Pursuant to section 74.351(a), she had 120 days, or until June 3, 2006, to serve one or more expert reports on the parties. See Tex. Civ. Prac. & Rem.Code Ann. § 74.351(a). On May 10, 2006, the district court held a hearing on Dr. Bray's objections to the adequacy of Constancio's original report, which was served on the same day she filed her original petition. At that hearing, the district court found the report deficient and granted Constancio an extension to cure the deficiencies under section 74.351(c). However, the parties disputed the proper application of the statutory cure period provisions:
[Counsel for Bray]: I assume it's the Court's ruling that [Constancio] would have thirty days under the new law in which to cure
The Court: I apologize. I did forget that. Under 95(i) you didn't, but you still have time to cure that, as I understand it.
[Counsel for Constancio]: Is it thirty days from the end of 120, Your Honor?
The Court: Now that, I cannot tell you.
[Counsel for Bray]: From the date the Plaintiff first received notice of the Court ruling, so our position would be it would be thirty days from today, Your Honor.
....
The Court: Okay. So you [Constancio] are granted one thirty day extension from today's date, okay? That will be the order of the Court.
Under the court's ruling, Constancio had 30 days from the date of the hearing, or until June 10, 2006, to cure the deficiencies in her report. The district court's due date had the effect of extending the original 120-day report deadline by only 7 daysJune 3 to June 10. The question presented is whether the cure and extension provisions of section 74.351(c) may be *160 applied in this manner or whether the statute requires the district courtwhen granting an extensionto extend the 120-day report deadline, at a minimum, by 30 days to 150 days from the filing of the original petition.[4]
Our resolution of this issue turns on the specific language of the relevant portions of section 74.351 setting out the procedures for serving expert reports in heath care liability cases. When, as here, the language of the statute is unambiguous, we adopt the interpretation supported by the plain language. State ex rel. State Dep't of Highways & Pub. Transp. v. Gonzalez, 82 S.W.3d 322, 327 (Tex.2002). We will not give an undefined statutory term a meaning that is out of harmony or inconsistent with other provisions in the statute. McIntyre v. Ramirez, 109 S.W.3d 741, 745 (Tex.2003).
A claimant pursuing a health care liability claim "shall, not later than the 120th day after the date the original petition was filed, serve on each party or the party's attorney one or more expert reports." Tex. Civ. Prac. & Rem.Code Ann. § 74.351(a). The court may grant a one-time extension to cure deficiencies of an expert report as follows:
If an expert report has not been served within the period specified by Subsection (a) because elements of the report are found deficient, the court may grant one 30-day extension to the claimant in order to cure the deficiency. If the claimant does not receive notice of the court's ruling granting the extension until after the 120-day deadline has passed, then the 30-day extension shall run from the date the plaintiff first received the notice.
Id. § 74.351(c). Thus, under the plain language of the statute, an extension of time to cure deficiencies of a report is only available when a report has been served within the 120-day deadline and elements of the report have been found deficient by the district court. The court's finding that the report is deficient, in the terminology of the statute, means that a complying or satisfactory expert report has not yet "been served" within the 120-day deadline. See Lewis v. Funderburk, 253 S.W.3d 204, 207-08 (Tex.2008).
The statute does not indicate in any fashion that the serving of a report that is found to be deficient has the effect of ending the running of the 120-day period in which in the plaintiff may attempt to serve a complying report. To the contrary, if a report is served, objected to, and found deficient by the district court before the 120-day deadline has passed, the claimant has the remainder of the 120 days in which he may decide to cure the deficiencies of the report, serve an entirely new report, or do nothing before the defendant physician or health care provider may then file a motion to dismiss the claim. See id. § 74.351(a)-(b). Nowhere does the statute state that the 120-day deadline will be cut short by the claimant filing a deficient report or by filing no report at all. Consequently, there is never a need, nor is there any statutory authority for, a trial court to grant an extension that is designed to run within the 120-day statutory period. It follows that the extension referenced in subsection (c) must be an extension of the 120-day period that the statute already allows plaintiffs to put together their expert reports. This means that when a trial court grants a section *161 74.351(c) extension, it is extending the 120-day deadline to 150 days from the date of the filing of the original petition. It is not simply a new deadline for the plaintiff to serve an amended or revised report that is 30 days from the date the trial court finds a report deficient. A plaintiff has, by statute, 120 days from the filing of the petition in which to get a complying report served even if the plaintiff has already served one or more non-complying reports. The entire purpose of section 74.351(c) is to extend the 120-day period if the trial court believes, in its discretion, such an extension is warranted. Such an extension is a one-time event, and its length is prescribed at 30 days, making the extended period 150 days from the date of the petition or 30 days from the date the claimant receives notice of the order granting the extension, if received outside the 120-day period. Id. § 74.351(c).
If an expert report is served early in the statutory period and objections are filed and heard right away, a revised complying report could well be served within the 120-day statutory period without any need for an extension. However, the statutory scheme plainly contemplates the possibility that a plaintiff, thinking he has served a complying report within the deadline, may not find out that the trial court views the situation differently until near the end of the 120-day period, or after it has run. In such a situation, the legislature has given trial courts the authority to extend the 120-day period for 30 days to give a plaintiff an opportunity to amend or revise a deficient, but potentially curable, report. In that case, the statute can have the effect of extending the period beyond 150 days if the plaintiff does not receive notice of the court's grant of the extension within the 120-day period. This procedure has the effect of giving plaintiffs the full benefit of the 120-day statutory period for serving a report while also preventing them from being blind-sided by an unexpected ruling from the court or objections to the report that are not required to be filed until the end of the 120-day period or after the period has run. Interpreting the extension contemplated by section 74.351(c) in any other manner would effectively read it out of the statute as well as create an incentive for plaintiffs not to serve their expert reports as early as possible for fear of losing their time cushion for working on their reports that the 120-day period was intended to provide.
Dr. Bray argues that the 30-day extension begins to run from the date the claimant receives notice of the district court's ruling granting the extension, regardless of whether the 120-day filing deadline has passed as of that date. We disagree. The statute requires the 30-day extension of the deadline to run from the date the claimant receives notice of the district court's ruling granting the extension only if the 120-day deadline has passed. See id. This is entirely sensible to account for the possibility that a trial court may not conduct a hearing on the adequacy of an expert report until after the 120-day period has run. A 30-day extension of the 120-day period upon a ruling 60 days after the 120-day deadline has run would not be of much use to a plaintiff unless the extension ran from the date of the notice of the extensionhence, the need for the statutory exception. An exception is not needed when a claimant receives notice of the district court's ruling that the report is deficient well before the 120-day deadline has passed because the plaintiff has time to react within the deadline of the statute. Consequently, the statute does not require the 30 days to begin running on the date the extension is granted if it is granted before the 120-day *162 period ends. If granted before the 120-day period ends, as previously discussed, the 30-day extension extends the 120-day period to 150 days.
In this case, the district court expressed its intention to grant Constancio an extension under section 74.351(c). However, by only granting Constancio a 30-day extension from the date of the hearing, which was some 23 days before the end of the period for serving a complying report, the district court did not actually grant Constancio a 30-day extension of the 120-day period as required by section 74.351(c). The practical effect of the district court's order was to extend the 120-day filing period by only 7 days. According to the terms of subsection (c), the one-time extension of the 120-day filing deadline must be a 30-day extension. The statute does not give trial courts discretion as to how long the extension will be. Either the claimant gets "one 30-day extension" of the deadline or no extension at all. Id. § 74.351(c). The district court's application of section 74.351(c) in this case resulted in only a 7-day extension of the 120-day filing deadline. Such a result is not permitted by the statute. Therefore, we conclude that the district court abused its discretion by applying section 74.351(c) in this manner.

Conclusion
We agree with the district court that Constancio's first amended expert report was deficient with respect to causation, and we affirm the district court's finding in that regard. However, we are of the view that the district court's application of the extension provisions of section 74.351(c) was erroneous and failed to afford Constancio the extension, when granted, that the statute required. It is not clear to us on this record whether the district court would have granted additional time to the plaintiff if the court understood it was authorized to do so or whether the court was of the view that it had fully exercised all of its discretion allowed by the statute because it had granted an extension on May 10, 2006. The error in failing to properly extend the 120-day period also affected other aspects of the procedure in this case such as the filing and hearing of the defendant's motion to dismiss within what should have been the extended period for serving expert reports.
Constancio argues that, because of the district court's erroneous calculation of the extension period to cure, she should be granted a 30-day extension from the date that she received notice of the district court's ruling granting the defendant's motion to dismiss. That would have the effect of making her second amended report served on August 17, 2006, timely. However, the statute does not allow for this result. Section 74.351(c) provides that when a plaintiff receives notice of the grant of an extension outside of the original 120-day period for serving reports, the 30-day extension period will run from the date that the plaintiff receives notice of the court's order granting the extension. Id. The statute does not allow for the extension period to run from the date the plaintiff receives notice of the court's ruling on a motion to dismiss. Nor is the appropriate remedy to simply declare that when the district court granted an extension on May 10, 2006, it had the effectdespite the court's stated June 10 deadlineof extending the period for serving reports to the 150th day or July 3. The parties took action in reliance on the erroneous June 10 deadline, such as filing and responding to a motion to dismiss in what should have been the extended period for serving reports. Neither can we order the district court to grant a new 30-day extension. The grant of an extension under *163 section 74.351(c) is a decision within the district court's discretion, not this Court's. Id. The statute does not allow an appellate court to decide the question of whether an extension should be granted beyond the review of such a decision on an abuse of discretion standard.
Although the district court granted an extension here, the error in how the extension was granted affected the process and prejudiced the plaintiff. Under these circumstances, we remand to the district court for the court to consider whether to exercise its discretion to grant the type of extension allowed, and of a duration required, by section 74.351(c). We express no opinion as to whether such an extension is appropriate at this point, as that is a matter within the discretion of the district court. Should the district court continue in its view that an extension to cure under section 74.351(c) is warranted, such an extension at this point must be for 30 days and must run from the date the plaintiff receives notice of the court's order granting the extension.
Consequently, we reverse the district court's order dismissing Constancio's claims and remand this cause to the district court for further proceedings consistent with this opinion.
Dissenting Opinion by Justice PATTERSON.
JAN P. PATTERSON, Justice, dissenting.
The expert report requirement for health-care liability claims serves a gatekeeping function designed to promptly identify frivolous lawsuits while preserving meritorious claims. At this early stage in the proceedings, the key concerns are identifying the specific conduct at issue and demonstrating the expert's opinions have a sound basis. The standards are "objective good faith" and "fair summary of the expert's opinions." Tex. Civ. Prac. & Rem.Code Ann. § 74.351(l), (r)(6) (West Supp.2008). Because the second expert report served by appellant in this case meets those standards, I would reverse the trial court's order granting Dr. Bray's motion to dismiss. For this reason, I respectfully dissent.

FACTUAL AND PROCEDURAL BACKGROUND
On February 3, 2006, appellant filed suit against Shannon West Texas Memorial Hospital and Dr. James Bray, alleging that they negligently caused the death of her husband, Ruben Constancio. According to appellant's petition, Mr. Constancio suffered a cardiorespiratory arrest on December 1, 2003; he was resuscitated and his vital signs were restored, but he never recovered and was pronounced dead on December 13, 2003. Only the claims against Dr. Bray are currently before this Court. Appellant alleged that Dr. Bray, who treated Mr. Constancio on November 30, 2003 and December 1, 2003, was negligent in (i) ordering Ativan, morphine and Phenergan[1] to be administered to Mr. Constancio in the face of respiratory distress; (ii) not coming in to evaluate the patient in the face of respiratory distress and deterioration; and (iii) decreasing the frequency of nursing assessments and vital sign checks in the face of respiratory distress and deterioration.
On the same date appellant filed suit, she served the expert report and curriculum vitae of Dr. J. Steven Hata, a triple board-certified physician who serves as director *164 of the Surgical Intensive Care Unit at the University of Iowa College of Medicine. See id. § 74.351(a) (requiring claimant in health care liability case to file expert report and curriculum vitae within 120 days of filing suit). Dr. Bray filed a motion objecting to the adequacy of the expert report on February 22 (19 days after Dr. Hata's report was served). See id. (requiring defendant whose conduct is implicated in report to file and serve any objections to report's sufficiency within 21 days after report was served). In response, appellant asserted that the expert report was adequate and that the motion should be denied, but requested, in the alternative, that the court grant a 30-day extension in which to cure any defects in the report. The court held a hearing on Dr. Bray's motion on May 5 (96 days after the original report was served) and found that Dr. Hata's expert report did not sufficiently address the standard of care applicable to Dr. Bray or causation. The court therefore granted Dr. Bray's motion, but also granted appellant's request for a 30-day extension, with the extension to run from that date, May 5.
On May 30 (day 116), appellant filed an amended report from Dr. Hata. Dr. Bray filed a motion to dismiss asserting that this second report also was inadequate. See id. § 74.351(b)-(c) (mandating dismissal with prejudice for failing to serve expert report within 120-day period unless court grants one-time, 30-day extension). Appellant filed a response and again requested an extension. The trial court found that the second report failed to adequately address causation and therefore granted Dr. Bray's motion to dismiss. The court also denied appellant's request for an extension.

The expert report requirement
In a health-care liability claim, the claimant must provide each defendant with one or more expert reports, including a curriculum vitae for each expert, within 120 days of filing the original petition. Id. § 74.351(a). An "expert report" is:
a written report by an expert that provides a fair summary of the expert's opinions as of the date of the report regarding applicable standards of care, the manner in which the care rendered by the physician or health care provider failed to meet the standards, and the causal relationship between the failure and the injury, harm, or damages claimed.
Id. § 74.351(r)(6). A report need not marshal all of the plaintiff's proof, but it must include the expert's opinion on each of the elements identified in the statute. American Transitional Care Ctrs. of Tex., Inc. v. Palacios, 46 S.W.3d 873, 878 (Tex.2001). To constitute a good faith effort, the report must inform the defendant of the specific conduct called into question and provide a basis for the trial court to determine that the claims have merit. Id. at 879. A report does not fulfill these two purposes if it fails to address the standard of care, breach of the standard, and causation, or if it merely states the expert's conclusions regarding these elements. Id. The expert must explain the basis of his statements to link his conclusions to the facts. Bowie Mem'l Hosp. v. Wright, 79 S.W.3d 48, 52 (Tex.2002) (quoting Earle v. Ratliff, 998 S.W.2d 882, 890 (Tex.1999)).

Dr. Hata's second report
Appellant filed three reports from Dr. Hata. At issue on appeal is the adequacy of the second report, which was filed on May 30, 2006. That report begins with a summary of Dr. Hata's qualifications and then recounts the medical care Mr. Constancio received after he was admitted to the hospital on November 29, 2003, with "complaints of cough, cold symptoms, abdominal pain, and delirium":

*165 On 11/30/03 Dr. Bray reported that the patient was mildly agitated.... He stated that agitation might be secondary to pain. At 0100 he ordered wrist restraints. At 0145 Mr. Constancio showed a pulse oximetry[2] reading of 84-85% on room air. At 0405 hours Dr. Bray ordered nebulized bronchodilators. Nursing notes report coarse respiratory sounds. At 0503 hours Dr. Bray decreased vital sign monitoring from every one hour to every 4 hours. At 0830 hours he ordered Phenergan, Ativan, and morphine orally or intravenously on an as necessary basis. At 1400 hours Dr. Bray ordered Haldol 10 milligrams IV. Nursing notes at 2000 hours report that the patient was in a supine position, "thrashing around agitated", with coarse breaths bilaterally. Mr. Constancio's Glasgow score decreased from 15 to 12 by 2300 hours.
On 12/1/03 at 0040 Mr. Constancio showed tachypnea with a respiratory rate of 32 with bilateral wheezes with a heart rate of 102. No pulse oximetry was reported. His nurse reports that he was agitated at 0145 hours. There was no report of pain, nausea, or anxiety. The nurse ... injected lorazepam 0.5 mg IV, morphine 2.0 mg IV, and Phenergan 25 mg IV, all at 0145 hours into Mr. Constancio. There are no vital signs written at this time or pulse oximetry. At 0230 hours, Mr. Constancio was reportedly asleep. Mr. Constancio coded at 0340 hours. He required intubation and mechanical ventilation. He was then admitted to the ICU and treated with broad-spectrum antibiotics. Blood cultures were positive for methicillin resistant Staphylococcus aureus. Chest x-ray showed chest infiltrates suggestive of pulmonary edema.
The patient showed no responsiveness after the event. Dr. Chang[3] stated that findings were consistent [with] anoxic encephalopathy.[4] The patient died on 12/13/03.
The report next lists six actions the standard of care applicable to Dr. Bray allegedly required:
Based upon the medical condition of Mr. Constancio [and] based upon the medical record, the standard of care for Dr. Bray would have required:
(1) Re-evaluation of the increasingly disoriented patient on 11/30/03 and 12/1/03 by going to the patient's bedside, listen[ing] to the lungs with a stethoscope and performing a neurologic examination;
(2) obtain current blood studies of his glucose level to monitor for diabetic ketoacidosis with blood tests;
(3) monitor continuous oxygen saturation levels with the use of pulse oximetry recorded at least every 15 minutes;
(4) increase, rather than decrease, the frequency of monitoring vital signs (blood pressure; pulse; respirations; and blood oxygen saturation);
(5) admit Mr. Constancio to ICU for intensive monitoring;

*166 (6) place Mr. Constancio on supplemental oxygen.
The report then states that Dr. Bray deviated from the standard of care because he failed to take each of the six actions listed. The report ends with a two-paragraph discussion titled "Causation":
Had Dr. Bray complied with the standard of care, within reasonable medical probability, Mr. Constancio would not have died when he did. Closer evaluation on 11/30/03 and 12/1/03 would have led Dr. Bray to recognize that Mr. Constancio's agitation was not a response to pain, but a symptom of hypoxemia.[5] Hypoxia[6] probably caused this patient to become agitated. This is confirmed with a pulse oximetry reading of 84-85%. Pulse oximetry at this level in this patient is significantly abnormal and indicates hypoxemia.
In the face of these changes, Dr. Bray reduced Mr. Constancio's monitoring schedule. Had Dr. Bray admitted Mr. Constancio to the Intensive Care Unit, Mr. Constancio would have received constant monitoring and his hypoxic condition would have been, in reasonable medical probability, recognized by the nursing staff and alerted Dr. Bray. The standard of care at that point in time would be for Dr. Bray to put Mr. Constancio on supplemental oxygen or a ventilator; treat the diabetic ketoacidosis by lowering his blood glucose, and he would have recognized the combination effects of the medications given and reversed those with medical support in the Intensive Care Unit. Had this been done, Mr. Constancio would not have, in reasonable medical probability, died during that hospitalization, and would have, in reasonable medical probability, recovered and been discharged. Diagnosis would be community acquired pneumonia and diabetic ketoacidosis, the majority of patients with this diagnosis survive if reasonable care is provided.

ANALYSIS
On appeal, appellant contends that (1) the trial court erred in granting Dr. Bray's motion to dismiss because Dr. Hata's second report was sufficient, and (2) the trial court erred in granting an extension of time that was not in conformance with the statutory 30-day extension provided by section 74.351(c). See Tex. Civ. Prac. & Rem.Code Ann. § 74.351(c).

Standard of review
We review a trial court's ruling on a motion to dismiss under section 74.351(b) for an abuse of discretion. See Palacios, 46 S.W.3d at 877-78. We also review a trial court's order granting or denying a 30-day extension to cure an expert report using an abuse of discretion standard. Ogletree v. Matthews, 262 S.W.3d 316, 321 (Tex.2007). A trial court abuses its discretion if it acts in an arbitrary or unreasonable manner or without reference to any guiding rules and principles. Downer v. Aquamarine Operators, Inc., 701 S.W.2d 238, 241-42 (Tex.1985). When reviewing matters committed to the trial court's discretion, we may not substitute our own judgment for that of the trial court. Walker v. Gutierrez, 111 S.W.3d 56, 63 (Tex.2003).

The motion to dismiss
A report may be held inadequate as to causation only if it does not constitute an objective good faith effort to provide a fair summary of the expert's causation opinions. *167 Tex. Civ. Prac. & Rem.Code Ann. § 74.351(l), (r)(6). The supreme court addressed the adequacy of an expert report's discussion of causation under the former expert report statute in Bowie Memorial Hospital, 79 S.W.3d at 48. In that case, the court upheld a trial court's determination that an expert report failed to adequately address causation. Id. at 53. The report included only one statement addressing causation: "I do believe that it is reasonable to believe that if the x-rays would have been correctly read and the appropriate medical personnel acted upon those findings then [the plaintiff] would have had the possibility of a better outcome." Id. at 51. The court concluded that, because the report lacked "information linking the expert's conclusion (that [the plaintiff] would have had `the possibility of a better outcome') to [the defendant's] alleged breach (that it did not correctly read and act upon the x-rays), the trial court could have reasonably determined that the report was conclusory." Id. at 53. The court stated that, "while the expert report does not need to marshal all the evidence necessary to establish causation at trial, it must contain sufficiently specific information to demonstrate causation beyond mere conjecture." Id. at 52.
Relying on Bowie Memorial Hospital, 79 S.W.3d at 51, the majority concludes that Dr. Hata's second report did not adequately "indicate" and state what "ultimately" caused Mr. Constancio's death. I disagree. The statements in Dr. Hata's report are distinguishable from the conclusory statements at issue in those cases cited by the majority. While the initial statement alone in Dr. Hata's report addressing causation"Had Dr. Bray complied with the standard of care, within reasonable medical probability, Mr. Constancio would not have died when he did"is conclusory, Dr. Hata's report goes further. As the majority recognizes, the report clearly ties Dr. Bray's failure to re-evaluate or more closely evaluate Mr. Constancio on November 30 and December 1 to Dr. Bray's failure to diagnose hypoxemia. The report states that such evaluation "would have led Dr. Bray to recognize that Mr. Constancio's agitation was not a response to pain, but a symptom of hypoxemia." This conclusion is tied to the facts by the statements that (1) "[h]ypoxia probably caused this patient to become agitated;" (2) "[t]his is confirmed with a pulse oximetry reading of 84-85%;" and (3) "[p]ulse oximetry at this level in this patient is significantly abnormal and indicates hypoxemia."
Similarly, the report ties the decrease in monitoring vital signs and the failure to admit Mr. Constancio to the ICU for intensive monitoring to the failure to diagnose hypoxemia. The report states that, "[i]n the face of these changes [i.e. significantly abnormal pulse oximetry and agitation likely due to hypoxia], Dr. Bray reduced Mr. Constancio's monitoring schedule. Had Dr. Bray admitted Mr. Constancio to the Intensive Care Unit, Mr. Constancio would have received constant monitoring and his hypoxic condition would have been, in reasonable medical probability, recognized by the nursing staff and alerted Dr. Bray."
The report's next statement lists the actions that should have been taken after recognizing hypoxemiaputting Mr. Constancio on supplemental oxygen or a ventilator, lowering his blood glucose to treat his diabetic ketoacidosis, and recognizing and reversing the combination effects[7] of *168 the medications given. The report then states that "[h]ad this been done, Mr. Constancio would not have, in reasonable medical probability, died during that hospitalization, and would have, in reasonable medical probability, recovered and been discharged." Viewed in isolation, this sentence would seem conclusory. However, this statement is tied to the previously mentioned three actions Dr. Hata states should have occurred after recognizing hypoxemia. It is also linked to the subsequent sentence, which states that the "[d]iagnosis would be community acquired pneumonia and diabetic ketoacidosis, [and] the majority of patients with this diagnosis survive if reasonable care is provided." Dr. Hata's final sentence clarifies that he believes Mr. Constancio had community acquired pneumonia and diabetic ketoacidosis, but that Mr. Constancio would not have died from those conditions had he received reasonable care.
The majority faults the report for failing to make an additional link that ties the failure to diagnose Mr. Constancio's hypoxemia to his ultimate death. According to the majority, Dr. Hata's report fails to make this final link because he mentions several medical conditions but never expressly states from what Mr. Constancio died. Dr. Hata's report, however, states that Mr. Constancio "showed no responsiveness" after he coded and that "Dr. Chang stated that the findings were consistent [with] anoxic encephalopathy," which is a degenerative disease of the brain caused by hypoxia. See supra note 4. The next sentence states that "[t]he patient died on 12/13/03." At a minimum, Dr. Hata's report ties the failure to diagnose hypoxemia to Mr. Constancio coding and showing no responsiveness after he coded. The majority concludes that this link is not sufficient to sustain appellant's claim. I disagree.
The report satisfies the standards required by the statute-"fair summary of the expert's opinions" and "objective good faith." Dr. Hata's report addresses all three statutorily required elements and states more than mere conclusions as to each element.[8]See Palacios, 46 S.W.3d at 878. It also explains the factual basis for Dr. Hata's statements, links his conclusions to the facts, and contains "sufficiently specific information to demonstrate causation beyond mere conjecture." See Bowie Mem'l Hosp., 79 S.W.3d at 52. The report links the alleged breaches of the standard of care to Dr. Bray's failure to diagnose hypoxemia and further links the failure to diagnose hypoxemia to Mr. Constancio's coding and showing no responsiveness after coding. The report therefore represents a fair summary of Dr. Hata's opinions. See Tex. Civ. Prac. & Rem.Code Ann. § 74.351(r)(6). In addition, the report informs Dr. Bray of the *169 specific conduct called into question and provides a sufficient basis to determine whether the claims have merit. See Palacios, 46 S.W.3d at 879. The report therefore also represents "an objective good faith effort to comply with the definition of an expert report." See Tex. Civ. Prac. & Rem.Code Ann. § 74.351(l), (r)(6). Because the report provides a fair summary of Dr. Hata's opinions and represents an objective good faith effort to comply with the definition of an expert report, the trial court abused its discretion in granting Dr. Bray's motion to dismiss. I would reverse the trial court's order.

Extension of time
With regard to the second issue, I agree with the majority that the trial court improperly calculated the period of time to cure the deficiencies of the first amended report, resulting in only a 7-day extension of the 120-day deadline for serving reports. Having exercised its discretion to grant an extension to cure a report it found deficient, the trial court does not have discretion as to the length of the extension. Section 74.351's plain language permits the court to grant "one 30-day extension to the claimant in order to cure the deficiency." Id. § 74.351(c); Leland v. Brandal, 257 S.W.3d 204, 209-10 (Tex., 2008) (discussing 30-day extension); Ogletree, 262 S.W.3d at 321 (same). I therefore disagree with the majority's general remand. Because the trial court has exercised its discretion to grant an extension, but erred as to its length as the majority also seems to conclude, I would remand with instructions to grant "one 30-day extension."

CONCLUSION
Because the second expert report proffered by Constancio satisfies the statutory requirements for an expert report and the trial court therefore abused its discretion in granting Dr. Bray's motion to dismiss, I would reverse the trial court's order. Alternatively, I would remand with instructions to grant the statutory extension.
NOTES
[1]  We agree with the district court that Constancio's expert report constitutes "some report" although it is defective. The defects are not such that it is subject to being categorized as "no report." It is, therefore, within the category of reports that are potentially subject to the provisions of section 74.351(c). See Austin Heart P.A. v. Webb, 228 S.W.3d 276, 284-85 (Tex.App.-Austin 2007, no pet.).
[2]  Shannon West Texas Memorial Hospital was originally a named defendant in this lawsuit. However, on August 10, 2006, the district court severed Constancio's claims against Shannon West Texas Memorial Hospital from her claims against Dr. Bray. Thus, the only claims in this appeal are Constancio's claims against Dr. Bray.
[3]  After Constancio filed her original petition in this cause on February 3, 2006, she had 120 days, or until June 3, 2006, to file and serve on each party or the party's attorney one or more expert reports. See Tex. Civ. Prac. & Rem.Code Ann. § 74.351(a) (West Supp.2008). June 3, 2006, fell on a Saturday. Thus, the request for an extension "until thirty days from June 2, 2006," in Constancio's response to Dr. Bray's motion to dismiss, was a reference to the last business day of the 120-day period for serving expert reports.
[4]  We note that this would be a minimum extension. The statute plainly provides that when notice of the court's order granting an extension is received by a plaintiff outside of the 120-day period for serving reports, the 30 days runs from the date the plaintiff receives notice of the court's order granting the extension.
[1]  In her first-amended petition, appellant contends that these three drugs cause respiratory depression to some degree and "in combination they can synergistically significantly increase respiratory depression."
[2]  A pulse oximeter is a device that measures the oxygen saturation of arterial blood. Dorland's Illustrated Medical Dictionary 1343 (Douglas M. Anderson chief lexicographer, 30th ed.2003) [hereinafter Dorland's].
[3]  Appellant's first amended petition states that Mr. Constancio was a patient of Dr. Chang, but that Dr. Bray was Dr. Chang's "covering partner" on November 30, 2003, and December 1, 2003.
[4]  Anoxic encephalopathy is synonymous with hypoxic encephalopathy, which is a degenerative disease of the brain caused by hypoxia from either decreased rate of blood flow or decreased oxygen content of arterial blood. Dorland's, supra note 2, at 610-11.
[5]  Hypoxemia is deficient oxygenation of the blood. Dorland's, supra note 2, at 900.
[6]  Hypoxia is a reduction of oxygen supply to tissue below physiological levels despite adequate perfusion of the tissue by blood. Id.
[7]  Dr. Hata's original report included an explanation of the "combination effects" of the medications. In that report, he stated that "[i]t is well understood in medicine that the use of Ativan, Phenergan and morphine when injected in close proximity of time raises unreasonable risk of synergistic reaction greatly exacerbating each of the drug's individual abilities to provoke respiratory depression and/or respiratory arrest." In that report Dr. Hata also expressly stated his opinion of what caused Mr. Constancio's death: "The injections of these three drugs increased the risk of somnolence and respiratory failure in this patient. It is my opinion that these medications given caused the patient's death due to the depression of his respiratory function." These statements were not included in Dr. Hata's second report.
[8]  An expert report will necessarily include the conclusions of an expert. Problems with adequacy arise when the report states mere conclusions, such as a single statement that the breach of the standard of care caused the injury. These types of conclusory statements do not inform the defendant of the specific conduct called into question and do not provide a basis for the trial court to determine that the claims have merit. See American Transitional Care Ctrs. of Tex., Inc. v. Palacios, 46 S.W.3d 873, 878 (Tex.2001).
