
222 P.3d 751 (2009)
232 Or. App. 563
Arin Lynn UMBERGER, Petitioner-Appellant,
v.
Stan CZERNIAK, Superintendent, Oregon State Penitentiary, Defendant-Respondent.
02C12135; A135072.
Court of Appeals of Oregon.
Submitted on November 19, 2009.
Decided December 16, 2009.
*752 James N. Varner, Dundee, filed the brief for appellant.
John R. Kroger, Attorney General, Jerome Lidz, Solicitor General, and Katherine H. Waldo, Senior Assistant Attorney General, filed the brief for respondent.
Before SERCOMBE, Presiding Judge, and BREWER, Chief Judge, and LEONARD, Judge pro tempore.
PER CURIAM.
Petitioner appeals a judgment denying his amended petition for post-conviction relief. Petitioner contends that he is entitled to relief because he received constitutionally inadequate assistance of counsel during his 1998 criminal trial for sodomy and sexual abuse. He argues that his trial counsel was inadequate when his counsel (1) failed to request an OEC 104 hearing regarding the qualifications of the state's witness, Dr. Bays, to testify about whether the victim had been sexually abused, and (2) failed to challenge Bays's qualifications to testify as an expert. We review for errors of law appearing on the record, ORS 138.220, and affirm.
To prevail on a claim of inadequate assistance of counsel under Article I, section 11, of the Oregon Constitution, petitioner has the burden of showing, by a preponderance of the evidence, "facts demonstrating that his criminal trial counsel failed to exercise reasonable professional skill and judgment and that counsel's failure had a tendency to affect the result of his criminal trial, that is, that petitioner suffered prejudice as a result." Cunningham v. Thompson, 186 Or.App. 221, 225, 62 P.3d 823, modified and adh'd to on recons., 188 Or.App. 289, 71 P.3d 110 (2003), rev. den., 337 Or. 327, 99 P.3d 290 (2004). A claim of inadequate assistance of counsel under the Sixth Amendment to the United States Constitution requires a similar showing. See Strickland v. Washington, 466 U.S. 668, 688, 694, 104 S.Ct. 2052, 80 L.Ed.2d 674 (1984).
At the time of petitioner's 1998 trial, the rule regarding expert testimony as to a diagnosis of child sexual abuse was exemplified in State v. Wilson, 121 Or.App. 460, 465-66, 855 P.2d 657, rev. den., 318 Or. 61, 865 P.2d 1297 (1993). There, we held that the trial court did not err in admitting expert testimony also by Baysthat diagnosed the child as a victim of sexual abuse. In that case, as in this case, there was no physical evidence of abuse. Id. at 462, 855 P.2d 657. Yet, we stated:
"Although, if believed, Bays' testimony supported the child's testimony, that does not render it a direct comment on the child's credibility. * * * A medical doctor is not precluded from testifying as to her medical diagnosis simply because the jury may infer from that testimony that another witness is or is not telling the truth."
Id. at 465, 855 P.2d 657 (emphasis in original); see also State v. Sanchez-Cruz, 177 Or.App. 332, 342, 33 P.3d 1037 (2001), rev. den., 333 Or. 463, 42 P.3d 1245 (2002) (holding that the methodology followed by Bays in reaching her diagnosis of child sexual abuse was reliable scientific evidence and it was not error to admit such evidence). Only recently, in State v. Southard, 347 Or. 127, 142, 218 P.3d 104 (2009), did the Oregon Supreme Court hold differently. The question on review in that case was "whether a diagnosis of `sexual abuse'i.e., a statement from an expert that, in the expert's opinion, the child was sexually abusedis admissible in the absence of any physical evidence of abuse." The court held that, "where, as here, that diagnosis does not tell the jury anything that it could not have determined on its own, the diagnosis is not admissible under OEC 403." Id.
To render assistance that is constitutionally adequate, trial counsel need not be clairvoyant. Given the state of the law prior to Southard, petitioner's trial counsel did not fail to exercise reasonable professional skill and judgment at petitioner's 1998 trial when counsel failed to request an OEC 104 hearing *753 or to object to Bays's qualifications as an expert.
Affirmed.
