Previously identified follicle recruitment markers include antral follicle count (AFC) and androstenedione which positively correlate with follicle recruitment.16 AFC is a reproducible predictor of follicular recruitment which has been shown to positively correlate with number of oocytes retrieved and IVF pregnancy outcome.18,19, 20 AFC measurements are stable throughout the ovarian cycle and before and after GnRH downregulation.21