Outcome measurements
SECONDARY, UTERUS
Our primary outcomes were chemical pregnancy, clinical pregnancy. BHCG serum was
measured 14 days after embryo transfer. Clinical pregnancy rates defined as the
observation of at least one fetus and heartbeat on transvaginal ultrasound after
the 42-day transfer.The secondary outcome was ongoing pregnancy, determined by a 12-week or longer
pregnancy; and also endometrial thickness was measured on the day of
progesterone administration. The endometrial measurements were done by two
researchers with similar criteria. They measured it in the thickest part of the
uterus on sagittal views, and it was repeated at least 3 or 4 times.