A comparison of endometrial histology with simultaneous plasma progesterone determinations in infertile women.

A retrospective analysis of 238 endometrial biopsies and simultaneous plasma progesterone determinations performed during the course of infertility evaluations is presented. The data suggest a high (93%) correlation between the two procedures for the detection of ovulation. Endometrial abnormalities were detected in 5% of the biopsies. Shortening of the cycle was noted in 36% of the patients, while only 3% demonstrated a longer cycle. Simultaneous measurement of plasma progesterone levels in association with the endometrial biopsy is believed to better document corpus luteum defects. One should be aware of the frequent occurrence of a shortened cycle on the basis of postbiopsy bleeding. Basal body temperature graphs should be utilized prior to biopsy in patients with a history of irregular menstrual cycles.