Most people arrive at this page holding one number and a lot of anxiety. Someone has drawn an AMH, or counted follicles on an ultrasound, or run a day-3 FSH, and the result has been described as low without much explanation of what it predicts and what it does not.
This page explains what each of these tests actually measures. It is not a substitute for having your own results interpreted — a single value read in isolation, without your age and the rest of your evaluation, is the most common way these tests get misunderstood.
What does an AMH result actually tell you?
Anti-Müllerian hormone is produced by small developing follicles in the ovaries, so the level reflects the size of that pool. What it is useful for is prediction of response to fertility medication — specifically, the number of eggs likely to be retrieved in a stimulation cycle. That makes it genuinely valuable for planning treatment.
What it does not do is measure egg quality. It is not a fertility score, and on its own it does not tell you whether you can conceive.
Dr. Paul Gindoff puts the distinction concretely: a 28-year-old with low AMH for her age is better positioned prognostically than a 38-year-old with above-average AMH, because AMH predicts egg yield, not quality. His full discussion is in why we do not turn patients away based on their odds.
Why your AMH number may not mean what you think
Several things change a measured AMH value without reflecting any change in your ovaries.
- Hormonal contraception. Combined oral contraceptives and some other hormonal methods can suppress a measured AMH. A result drawn while you are on them can read lower than your off-treatment value, which is a common and avoidable source of alarm. Tell whoever draws it what you are taking.
- The assay. AMH is measured by more than one commercial assay, and they do not all return the same value for the same sample. Comparing a result from one laboratory against a result from another, or against a figure you read online, can mislead you.
- The units. AMH is reported in nanograms per milliliter in some laboratories and picomoles per liter in others. The same sample produces two very different-looking numbers depending on which is used, so check the units before you compare anything.
- A single draw. Values vary somewhat between cycles and between draws. A result that does not fit the clinical picture is often worth repeating rather than acting on.
Unlike day-3 bloodwork, AMH does not have to be drawn at a particular point in your cycle.
What is an antral follicle count?
The antral follicle count is exactly what it sounds like: the number of small follicles a physician can see and count on a baseline transvaginal ultrasound. It gives a direct view of the follicles available at that point in the cycle, which is why it is used alongside AMH rather than instead of it.
The two tests measure overlapping things by different means, and they do not always agree. Where they diverge, the physician reads them together with your age and history rather than picking whichever is more reassuring.
What do day-3 FSH and estradiol add?
Follicle-stimulating hormone is the signal from the pituitary that recruits a follicle each cycle. Measured early in the menstrual cycle, a higher FSH can indicate that the ovaries need more stimulation than expected to respond.
FSH has to be interpreted together with estradiol drawn at the same time, because an elevated estradiol can suppress FSH and make that result look better than it is. An FSH reported without an accompanying estradiol is an incomplete result. These two have to be drawn in the first few days of the cycle to mean anything.
Which number matters most?
Age. Egg quantity and egg quality both decline over time, and of those two it is quality that these tests do not measure. That is why the same AMH value carries a different prognosis at 28 than it does at 40, and why no ovarian reserve test replaces the age on your chart.
This is also why none of these results should be read as a verdict. They describe how your ovaries are likely to respond to medication. They do not describe whether you will have a child.
Does a low result mean I need donor eggs?
Not by itself. Chelsea Fertility NYC does not accept or deny patients for treatment based only on likelihood of success, and does not use a low AMH result alone to direct someone toward donor eggs. The physicians review age, hormone testing, ultrasound findings, medical history, prior response and your goals before discussing what is medically appropriate.
Egg donation is one family-building option among several and should be presented fairly alongside treatment with your own eggs. The choice is yours; candidacy for any particular treatment is determined individually by the physician.
What to ask about your own results
If you are holding a result you do not understand, these are the questions worth asking the clinician who ordered it:
- What were the units, and which assay or laboratory ran it?
- Was I on hormonal contraception when this was drawn?
- Was an estradiol drawn at the same time as the FSH, and on which cycle day?
- What does this predict about how I would respond to medication?
- What does it not tell us?
- Does anything here change what you would recommend, or the timeline?
We review these results at consultation and explain what they mean for you specifically. If you were told elsewhere that you are not a candidate for treatment with your own eggs, that is one of the most common reasons people come to us for a fertility second opinion.
Where to go next
If a reduced ovarian reserve has been diagnosed or suggested, diminished ovarian reserve covers what that means for treatment. If you have not yet had a full workup, fertility testing and diagnosis sets out what an evaluation involves. If you are weighing egg freezing, these are the results that inform that decision, and that page sets out the realistic numbers.
Two longer reads: ovarian reserve, AMH and follicle count, and what FSH and AMH levels are good for.
Common questions
What does my AMH level mean?
AMH reflects the pool of small developing follicles in the ovaries and is used to predict how you are likely to respond to fertility medication — specifically the number of eggs likely to be retrieved in a stimulation cycle. It does not measure egg quality and it is not a fertility score. It has to be read alongside your age, ultrasound findings and the rest of your evaluation.
Can birth control affect my AMH result?
Yes. Combined oral contraceptives and some other hormonal methods can suppress a measured AMH, so a result drawn while you are taking them can read lower than your off-treatment value. Tell whoever draws the test what you are taking.
Does a low AMH mean I cannot get pregnant?
No. AMH predicts response to fertility medication rather than whether conception is possible. Age is what carries the egg-quality question, which is why the same AMH value means something different at different ages. Your physician will discuss your own prognosis based on your full evaluation.
When in my cycle should these tests be drawn?
AMH does not have to be drawn at a particular point in your cycle. FSH and estradiol do — they need to be drawn in the first few days, and FSH reported without an estradiol from the same draw is an incomplete result. Antral follicle count is done on a baseline ultrasound.
Why do two labs give me different AMH numbers?
AMH is measured by more than one commercial assay, and they do not all return the same value for the same sample. Results are also reported in different units depending on the laboratory. Check the units and the laboratory before comparing two results against each other.
Consultation is free for new patients; we bill health insurance where you have coverage that applies. Call 212-685-2229 or contact our team to have your results reviewed.
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Consultation is free for new patients; we bill health insurance where you have coverage that applies.