The accuracy of urinary luteinizing hormone testing in predicting ovulation

Area of Science:

• Reproductive endocrinology and infertility.
• Medical diagnostics and imaging.

Background:

• Accurate ovulation prediction is crucial for effective fertility treatments, including artificial insemination.
• Urinary luteinizing hormone (LH) testing is commonly used to time ovulation induction and insemination.

Purpose of the Study:

• To evaluate the accuracy of urinary LH testing in predicting ovulation compared to transvaginal ultrasonography.
• To assess the reliability of urinary LH surge detection for timing interventions in women undergoing fertility treatment.

Main Methods:

• 33 women with spontaneous ovulation were monitored starting on cycle day 10.
• Daily urinary LH testing and transvaginal ultrasonography were performed.
• Ovulation confirmation included luteal phase progesterone levels and endometrial biopsies.

Main Results:

• Both transvaginal ultrasonography and urinary LH testing detected ovulation in all studied cycles.
• In 9% of cycles, the urinary LH surge occurred after follicle rupture was ultrasonographically confirmed.
• This discrepancy raises questions about the predictive accuracy versus detection capability of urinary LH tests.

Conclusions:

• Urinary LH testing primarily detects ovulation rather than accurately predicting its onset.
• Transvaginal ultrasonography is recommended to confirm the presence of an unruptured follicle on the day of the urinary LH surge.
• This approach is particularly important for optimizing timing in artificial insemination cycles, especially for patients with persistent conception difficulties.