Ovarian Reserve

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated July 27, 2026

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 permanent verdict on reproductive potential. Low AMH or low AFC signals a smaller-than-average visible follicular pool. It does not explain why, and it does not close the door on natural conception. One competent follicle per cycle is all that is needed.

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 depleted follicular pool. No single marker is definitive. Used together, they build a picture of current ovarian function.

Low reserve markers are a starting question, not a finishing answer. In RRM, the workup looks for correctable contributors to the decline. Thyroid autoimmunity is one target of that workup: uncorrected thyroid dysfunction can compromise follicular health, and it responds to treatment. Vitamin D status is another: research on its relationship to AMH shows mixed findings across populations, so correcting a documented deficiency stands on its own clinical merits, not on a promised AMH benefit. Endometriosis causes direct ovarian damage through endometriomas and surgical scarring: excision addresses that structural source. A meta-analysis found DHEA supplementation was associated with higher AMH in women with diminished ovarian reserve, though the effect was weaker when limited to randomized trials.¹ These are starting points for investigation, not triage criteria for bypassing the diagnosis.

For women with premature ovarian insufficiency (POI), reserve assessment is part of a broader workup including genetic screening and autoimmune evaluation. For women with diminished ovarian reserve (DOR) without a POI diagnosis, identifying and addressing the underlying driver is the first clinical priority. An RRM clinician reads reserve markers alongside cycle chart data, a follicle maturation study, timed hormonal panels, and systemic workup. The number points toward the question. The workup builds the answer.

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.