IVF · Ovarian reserve
Diminished ovarian reserve — what AMH and antral follicle count actually tell us
Ovarian reserve is the residual quantity of follicles in the ovary. Tests that measure it — anti-Müllerian hormone (AMH) and antral follicle count (AFC) on ultrasound — are useful, but they predict the quantity of oocytes a stimulation will produce, not the quality of those oocytes and not the chance of pregnancy. This page explains how to interpret reserve tests, when to act on them, and how IVF is adapted when reserve is low.
What ovarian reserve measures
Reserve markers reflect the size of the remaining antral follicle pool. They predict oocyte yield with stimulation reasonably well. They do not reliably predict spontaneous conception probability and they do not predict oocyte quality — for which age remains the strongest single predictor.
- AMH — produced by granulosa cells of small antral follicles; cycle-day independent; reflects the antral follicle pool
- Antral follicle count (AFC) — the sum of follicles 2–10 mm across both ovaries on baseline ultrasound
- Day-2/3 FSH and oestradiol — older markers; less precise; still used in some pathways
Age-stratified ranges
Reserve normally declines with age. A “low” AMH in a 25-year-old is a different clinical situation from a “low” AMH in a 42-year-old.
- Under 30: AMH typically 2–6 ng/mL, AFC 12–20
- 30–35: AMH typically 1.5–4.5 ng/mL, AFC 10–16
- 35–40: AMH typically 0.7–3 ng/mL, AFC 7–12
- 40+: AMH typically 0.3–1.5 ng/mL, AFC 5–10
Wide individual variation exists; these are population ranges, not patient thresholds.
What low reserve does not mean
- It does not mean you cannot conceive spontaneously — many women with low AMH conceive without intervention
- It does not mean IVF will fail — it means yields will be lower and protocols need to be adapted
- It does not mean oocyte quality is poor — quality is largely age-determined
- It does not predict the timing of menopause precisely
What low reserve does signal
- Lower oocyte yield with stimulation
- Possibly fewer chances to repeat cycles before the reserve declines further
- A reason to start the fertility conversation sooner rather than later
- A reason to consider fertility preservation if pregnancy is not yet on the immediate horizon
IVF protocol adjustments
- Antagonist protocol with high-dose gonadotropin is the standard starting point
- Adjuvants (DHEA, CoQ10, growth hormone) considered selectively with honest evidence discussion (see poor responder protocols)
- DuoStim or oocyte accumulation across cycles where time is critical
- Realistic counselling about per-cycle yield and cumulative success
Fertility preservation timing
For patients with low reserve who are not yet ready to conceive, oocyte freezing in the early window can be a sound investment. The cost-benefit conversation explicitly covers: number of oocytes needed for a reasonable chance of a future live birth, cycles needed to reach that number, and the timing of the decision. The conversation is offered without pressure.
Donor egg conversation
Where multiple cycles do not produce viable embryos, the donor-egg conversation is offered as one option, not as a default. The decision is the patient’s; the role of the clinic is to share data and respect the patient’s values.
When to seek an opinion
- AMH below the age-stratified range, particularly in patients under 35
- Family history of early menopause
- Prior ovarian surgery
- Subfertility with declining reserve markers
- Considering fertility preservation
Guidelines we follow on this topic
- ESHRE Guideline on Ovarian Stimulation
- POSEIDON Group consensus
- ASRM committee opinion on ovarian reserve testing
- NICE fertility guidance
Related reading
Dr. Priyadatt Patel
Senior Gynecologist · Advanced Laparoscopic Surgeon · IVF and Endometriosis Programme Lead
MS OBGyn · Pregnancy Care · Advanced Gynaecological Ultrasound · Fertility Preservation
ESHRE / ESGE / AAGL / ASRM guideline-aligned practice. 3D Karl Storz precision technique. Fertility-preservation-first philosophy. Evidence-based decisions, honest counselling, long-term outcomes orientation.
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