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Diminished ovarian reserve, what AMH and AFC actually mean
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What is ovarian reserve and what does it not tell you?
Ovarian reserve is a measure of remaining egg quantity. It is not a measure of egg quality, and it is not a single-number prediction of whether someone can conceive. The two markers used in clinical practice are (, a blood test) and AFC (antral count, an early-cycle ultrasound count of small follicles).
is produced by the small follicles still in the resting pool. AFC counts the visible early follicles at the start of a cycle. Together they estimate how an ovary is likely to respond to stimulation. Neither is a strong predictor of natural conception in any single month.
Diminished (DOR) is the clinical phrase used when these markers fall below a defined threshold, but the thresholds themselves vary by lab, by assay, and by the criteria a clinician is using.
Where do AMH and AFC threshold numbers actually come from?
What are the biggest myths about diminished ovarian reserve?
Myth
Low AMH means I cannot conceive naturally.
Evidence
AMH predicts response to IVF stimulation, not month-to-month natural conception. Many people with low AMH conceive without intervention; many with normal AMH do not. Age and tubal/sperm factors carry more weight for natural conception than AMH alone.
Myth
My AMH dropped, my fertility has crashed.
Evidence
AMH varies by lab, assay, and cycle day. A single low result deserves a repeat and an AFC scan before any decision. Trends over months matter more than one number.
Myth
A high AMH is always good news.
Evidence
Very high AMH can flag PMOS-pattern ovaries and a different set of conversations. High is a signal, not a prize.
How does age interact with ovarian reserve measurements?
Age remains the strongest single predictor of egg quality. and AFC add a second axis, predicted response to stimulation, but they do not override age in the conversation about timelines.
A reading of reserve markers alongside age gives a fuller picture than either dimension alone. A low at 28 carries different implications than the same number at 38, and both carry different implications than the same number at 42.
What does a low AMH result actually mean, and what doesn't it mean?
A low reserve result is a prompt for an earlier conversation, not a prediction of failure. NICE NG257 frames it as a reason to discuss treatment options sooner, including egg freezing for those not yet , or moving more directly toward for those who are.
It is not a verdict. People with low reserve markers conceive every month, both naturally and with treatment. The framing matters: testing tells you what an ovary is likely to do under stimulation, and tells you something about timelines worth holding in view. It does not tell you whether you can become a parent.
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Authored and reviewed by clinicians from the founding team. Information only, not personalised medical advice.