Chinta P, Rebekah G, Kunjummen AT, et al. - Researchers performed a prospective diagnostic accuracy study including a total of 208 subfertile eumenorrheic women in order to determine the prevalence of ovulatory cycles in these women and to compare the diagnostic accuracy of a single ultrasound vs serum midluteal progesterone measurement in detecting ovulatory cycles. When midluteal serum progesterone level and ultrasound scanning were used as the reference test, subfertile eumenorrheic women had ovulatory cycle prevalence of 92.9% and 99.5%, respectively. Findings suggest a high prevalence of ovulatory cycles in eumenorrheic subfertile women. During the infertility workup in eumenorrheic women, a single well-timed ultrasound can be done to detect ovulatory cycles.