The antral follicle count by transvaginal ultrasound allows the specialist to estimate the woman's ovarian reserve, i.e. the number of eggs contained in her ovaries at that moment.
An AFR of 5-10 antral follicles (per ovary) is considered normal. However, if the AFR is lower, the ovarian reserve is low. Conversely, a count of more than 10 antral follicles indicates a high ovarian reserve.