Antral follicles are a stage of follicular development in which they still contain an immature oocyte inside. However, in each menstrual cycle, one of them will be susceptible to develop into a pre-ovulatory follicle and give rise to the ovulation of a mature oocyte.
These antral follicles are characterised by the fact that they begin to accumulate follicular fluid inside and are visible by ultrasound from 1-2 mm in diameter.
Read the full article on: What is an antral follicle count (AFC) and why is it performed? ( 61).
By Ana Fernández-Sanguino M.D. (gynaecologist), Elena Santiago Romero M.D. (gynecologist), Lidia Pérez García M.D., M.Sc. (gynecologist), Nicole Veras M.D. (gynecologist), Paloma Sánchez Gómez M. D. (gynecologist), Silvia Azaña Gutiérrez B.Sc., M.Sc. (embryologist), Xinxin Lin MD (gynecologist) and Michelle Lorraine Embleton B.Sc. Ph.D. (biochemist).
Last Update: 07/01/2021
