Done with transvaginal ultrasound scan with little patient discomfort. The antral follicles appear as small dark circular shadows measuring 2 to 8mm, whereby each follicle contains one egg.

A hormone produced by small follicles in the ovary which contains eggs.
Higher levels generally indicate a better ovarian reserve, and it declines rapidly from the age of 35 years old. It , however, does not predict the quality of eggs.