A follicular volume of >0.56 cm at trigger is the cutoff to predict oocyte maturity: a starting point for novel volume-based triggering criteria.

Objective: To determine the minimum follicular volume on the day of trigger that will correspond to a mature oocyte at egg retrieval by individualized follicular puncture and to calculate the mean follicular growth from ovulation induction to egg retrieval using SonoAVCfollicle.

Design: A prospective observational study of 53 women undergoing in vitro fertilization, in which it was possible to identify unequivocally one or more follicles at trigger and egg retrieval using three-dimensional ultrasound.

Setting: University-affiliated private in vitro fertilization center.

Volume-based follicular output rate improves prediction of the number of mature oocytes: a prospective comparative study.

Objective: To test whether volume-based follicular output rate (FORT-V) is superior to diameter based follicular output rate (FORT-D) in predicting the number of mature oocytes. The follicular output rate (FORT) is the ratio between preovulatory follicle count (PFC) and antral follicle count (AFC) and has been proposed as a better predictor of the ovarian response compared with AFC alone.

Design: A prospective observational study of 215 consecutive women (80 oocyte donors and 135 in vitro fertilization [IVF] patients) undergoing ovarian stimulation for IVF.