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The Ovulatory Cycle

A Histologic, Thermal, Steroid and Gonadotropin Correlation

From the Departments of Obstetrics and Gynecology and Pathology, Temple University Health Sciences Center and the Department of Obstetrics and Gynecology, Johns Hopkins Medical Center, Baltimore, Maryland.

Blood samples and rectal basal body temperatures were obtained daily during an ovulatory cycle from 8 healthy volunteer women who requested tubal ligation or tubal reconstruction. The tubal surgery was performed at planned intervals (1–12 days) after the LH peak. Biopsies of endometrium and corpus luteum were taken at the same time. Daily blood samples were analyzed for plasma estrone, estradiol, progesterone, follicle stimulating hormone, and luteinizing hormone by radioimmunoassay. The correlation of corpus luteum and endometrial dates was 0.97. Correlations were made between endometrial dates and time of thermal nadir (r =: 0.90), the time of the estradiol peak (r = 0.95), and the time of the LH peak (r = 0.97). Correlations were also made between corpus luteum date and time of thermal nadir (r = 0.96), time of the estradiol peak (r = 0.90), and time of the LH peak (r = 0.93). There was histologic evidence of ovulation during the 24-hr time period designated as Day 0.