Ultrasound observations in patients on gonadotrophin therapy.

Twenty-four courses of ovulation induction with HMG-HCG were accompanied by ultrasound sector scanning. The results of cross-sectional studies did not deviate from those reported for normal cycles. Cross-sectional studies indicate smaller peak follicular volumes than repeated measurements of the same follicles. Results may, however, be influenced by frequency and time of measurements, as well as frequency and time of coitus for the patients. Peak-size follicular volumes in patients who became pregnant were relatively large. Peak volumes connected with subsequent pregnancies may therefore have another range of variation than follicles releasing oocytes which will remain unfertilized.