Why has my AMH fallen? Compare the reports before the conclusions

AMH can fall because ovarian reserve changes with age, but differences between two results can also reflect the testing method, biological variation or hormonal contraception. A lower second result does not, on its own, prove that you have lost eggs at that rate, that egg quality has deteriorated or that you cannot conceive.

Seeing a lower number can make the future feel suddenly smaller. Before you translate it into a deadline, ask a more useful question: are these results genuinely comparable, and what decision should they help you make?

This article looks specifically at a change between reports. For the underlying distinction between ovarian reserve and egg quality, start with our AMH guide in the Fertility Library.

First, compare the reports rather than the numbers

Put the original reports side by side. Check the dates, units, laboratory and, if shown, assay: the laboratory method used to measure AMH. A result in ng/mL cannot be compared directly with a number in pmol/L. Even when the units match, different methods can produce different readings.

Write down any relevant changes between samples: starting or stopping hormonal contraception, ovarian surgery, medical treatment and a change in cycle pattern. If your report does not name the method, ask the provider whether it is comparable with the earlier test. Two results from the same provider may still need checking if its laboratory or method changed.

Does a drop mean my eggs are disappearing faster?

AMH is a marker related to small ovarian follicles. It is not a direct inventory of every egg in your ovaries. Reserve generally declines with age, but the change in AMH is not a count of eggs lost. A 30% lower AMH reading does not establish that 30% of your eggs disappeared between tests.

Two measurements also do not create a reliable personal countdown. The interval matters: results several years apart raise a different question from samples taken a few weeks apart. A persistent change can deserve attention without telling you exactly when fertility will end. The Complete Guide to Female Fertility explains how reserve fits alongside age, ovulation and the other stages of conception.

AMH is flexible to test, but it is not perfectly fixed

AMH is commonly measured without choosing a particular cycle day. That practical convenience does not mean a person's result never varies. In a prospective study published on 16 October 2018, Bungum and colleagues sampled 26 women across three menstrual cycles and measured AMH using three laboratory platforms. They observed variation over time as well as differences between methods.

This was a small study, involving participants aged 22–50 who were not receiving infertility treatment. It cannot tell you what percentage change is harmless for you or explain every unexpected report. It does show why a change needs interpretation before it becomes a conclusion about your reproductive future.

Could the pill explain a lower AMH?

Hormonal contraception can suppress ovarian-reserve markers. ASRM's 2024 committee opinion says this can affect AMH and antral follicle count, the small follicles counted on ultrasound. The effect concerns what the tests show; it is not evidence that contraception has used up your eggs.

In a prospective cohort of 68 women with long-term combined-pill use, published in January 2020, Landersoe and colleagues found that AMH and follicle counts rose after stopping the pill, with the group averages reaching a plateau after about two months. This was not a trial showing that stopping contraception improves fertility, nor a promise that everyone's AMH will rise.

Do not stop contraception simply to chase a higher result. Discuss whether reassessment would change a real decision, how contraception or symptom control would be managed, and whether your timetable allows it. The timing belongs in an individual plan, especially if treatment or preservation is time-sensitive.

What if the fall follows surgery or medical treatment?

Ovarian surgery and treatments that can affect ovarian function belong in the interpretation. The international 2023 PCOS guideline notes ovarian surgery among factors relevant to AMH levels. Your treating team's record of what happened is more useful than attributing a change to something you ate, a stressful month or a supplement you forgot.

If periods have become irregular or stopped, describe that change alongside the result. The ESHRE/ASRM premature ovarian insufficiency guideline, published in 2025, says AMH should not be the primary diagnostic test for that condition. A lower AMH alone is not a diagnosis of premature ovarian insufficiency or menopause.

A lower AMH changes some questions more than others

Trying to conceive: NICE NG257, published on 31 March 2026, advises against using AMH to predict pregnancy through spontaneous conception. A lower result cannot answer the whole question about your chance of conceiving. Timing, ovulation, sperm and reproductive anatomy still matter.

Preparing for IVF or egg freezing: AMH can help inform expectations about response to ovarian stimulation. Ask whether the new result changes the clinic's expectations, proposed treatment or discussion of alternatives. If you have already had stimulation, bring the actual response: follicles, eggs collected and mature eggs, where recorded. Do not replace that history with an online label.

Planning ahead: consider your age, goals and the options you want to keep open. AMH cannot give you a guaranteed number of safe years to delay pregnancy. You can seek information without committing to testing, freezing or immediate parenthood.

Should I repeat the test?

A repeat can be useful when it answers a specific uncertainty, such as comparability or the influence of contraception. Repeating it every month without an agreed decision can create more numbers and less clarity. Before paying, ask: what would we do differently if the repeat is higher, similar or lower?

Bring both reports, your current medicines, relevant treatment history and your main question. Ask whether the same laboratory method should be used, whether ultrasound adds useful context, and when review should happen. Necessary treatment should not be postponed while you try to achieve a preferred AMH number.

Questions readers often ask

Can AMH go up again?

Yes, a later measurement can be higher, including when a suppressive influence such as hormonal contraception changes. That does not establish that new eggs have been created or that egg quality has improved.

Is there a percentage drop that always means a problem?

No universal percentage can diagnose a problem from two reports. Dates, units, method, clinical history and the decision being considered matter. Ask for interpretation of your actual reports rather than a generic threshold.

Does lower AMH mean IVF will not work?

No. It may inform expectations about egg yield, but it is not a standalone verdict on treatment success. Your clinic should explain it alongside age, previous response and the rest of your assessment.

Read the result in context

The useful next step is understanding what changed and whether it affects your plans. Continue with our AMH and egg-quality guide, then the Complete Guide to Female Fertility. If preservation is your question, read egg freezing or embryo freezing for the decisions that a blood result cannot make for you.

Sources

• ASRM. Testing and interpreting measures of ovarian reserve, committee opinion (2020).
• NICE NG257. Investigation of fertility problems and management strategies, published 31 March 2026.
• Bungum and colleagues. AMH biological variability and three assay platforms, prospective cohort; 16 October 2018.
• Landersoe and colleagues. Ovarian reserve markers after discontinuing long-term combined oral contraceptives; Reproductive BioMedicine Online, January 2020.
• ASRM. The use of hormonal contraceptives in fertility treatments, committee opinion (2024).
• ESHRE, ASRM, CRE-WHiRL and IMS. Evidence-based guideline: premature ovarian insufficiency (2025).
• International evidence-based PCOS guideline recommendations (2023), Journal of Clinical Endocrinology & Metabolism.

Sources checked on 10 October 2026. General educational information; individual results need interpretation in their clinical context.