Ovarian Reserve

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 7, 2026

The ovarian reserve describes the pool of follicles currently available in the ovaries, estimated through surrogate markers: AMH, AFC, and basal FSH. Clinicians cannot count oocytes directly. These markers are proxies for follicular activity, not a balance sheet of remaining eggs.

Low reserve markers are a starting question, not a finishing answer. A low AMH or low AFC tells you the pool of visible follicles is smaller than average for age. It does not tell you why. And it does not close the door on natural conception. One competent follicle per cycle is all that is needed. The clinical question is what that follicle is doing, not how many follicles exist in the background.

Each marker captures something different. AMH reflects the number of small growing follicles actively producing the hormone. AFC counts the antral follicles visible on early-cycle ultrasound. Basal FSH rises as the pituitary increases its recruitment signal to a smaller follicular pool. Used together, these markers build a picture of current ovarian function. No single marker is definitive.

For women with reduced reserve, RRM evaluation looks for correctable contributors to the decline. Autoimmune thyroid disease accelerates follicle loss and responds to thyroid optimization. Vitamin D deficiency suppresses AMH and is correctable with repletion. Endometriosis causes direct ovarian damage through endometriomas and surgical scarring; excision addresses the structural source. Prior ovarian surgery may have reduced functional tissue, but what remains can often be supported. In documented low-DHEA-S cases, a meta-analysis of 8 studies found DHEA supplementation significantly raised AMH in women with diminished ovarian reserve.⁷⁷ These are starting points for investigation, not triage criteria.

For women with premature ovarian insufficiency, reserve assessment is part of a broader workup including genetic screening and autoimmune evaluation. For women with diminished ovarian reserve without a POI diagnosis, identifying and addressing the underlying driver is the first clinical priority. Reserve markers point toward the question. An RRM clinician builds the answer from the full picture: cycle chart, follicle maturation study, timed hormonal panels, and systemic workup.

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.