Afollicularism (AF)

Afollicularism is a cycle in which no ovarian follicle grows, even though menstrual periods still arrive on time. Dr. Thomas W. Hilgers developed and formalized the term within NaProTechnology. The term describes what serial ultrasound scans show across the days when ovulation should occur. No follicle grows in a meaningful way.¹ No dominant follicle, the lead follicle of the cycle, forms. No egg is released.

Afollicularism is one of the patterns in Hilgers' sonographic classification of ovulation disorders. The cycle can look normal from the outside. Its length may be regular. Bleeding arrives when expected. A Peak Day may still show on the chart. These signs cannot confirm that a follicle grew. A series of ultrasound scans, such as a follicle maturation study, can confirm it.

Ultrasound can show several distinct ovulation disorders. In Luteinized Unruptured Follicle Syndrome, the follicle grows but does not rupture to release the egg. In follicular deficiency, the follicle grows and ruptures on time, but it makes too little hormone. Afollicularism arises earlier than either disorder. No follicle grows far enough to become dominant. Anovulatory cycles is the broad term for any cycle without true ovulation. Afollicularism is one specific ultrasound pattern within that group.

The finding may point to a severely low ovarian reserve, the number of eggs that remain in the ovaries. This includes premature ovarian insufficiency. It may also point to other hormone disorders that need a closer look. A restorative workup seeks the cause instead of going around it. Until that cause is found and addressed, a cycle like this gives the couple no chance to conceive, even when it looks regular.