URINARY LUTEINIZING-HORMONE TESTING AND PREDICTION OF OVULATION IN SPONTANEOUS, CLOMIPHENE CITRATE AND HUMAN MENOPAUSAL GONADOTROPIN-STIMULATED CYCLES - A CLINICAL-EVALUATION

A urinary luteinizing hormone test was utilized to predict ovulation in 99 spontaneous, 122 clomiphene citrate, and 82 human menopausal gonadotropin stimulated cycles. Tests were performed in early morning and evening specimens and follicular development was monitored by daily ultrasonography. A positive detection rate of 98, 97, and 94%, respectively, was obtained. Evidence of luteinized unruptured follicles was seen more frequently in stimulated cycles, concurring with negative test results. In 2 spontaneous, 1 clomiphene citrate and 5 hMG induced cycles two distinct LH surges were detected concomitant with a pattern of follicular atresia and subsequent new follicular development. Most ovulations occurred between 16 and 28 h after LH detection, significantly earlier in spontaneous than in clomiphene citrate stimulated cycles (p < 0.02), whereas pre-ovulatory follicles were larger in the clomiphene citrate group (p < 0.001). The mean duration of the follicular and luteal phases, as calculated from the LH peak, was substantially shorter in the hMG cycles than in the other two groups (p < 0.001).