If you are considering pregnancy, IVF or egg freezing, you may have heard terms such as AMH, antral follicle count and ovarian reserve. These tests are commonly used in fertility care, but they are also frequently misunderstood.

One of the most important things to understand is that ovarian reserve testing is mainly about estimating the number of eggs remaining and predicting how the ovaries may respond to fertility treatment. It does not provide a simple measure of whether you can or cannot become pregnant naturally.

What Is Ovarian Reserve?

Women are born with a finite number of eggs. Unlike sperm, which are continually produced, the number of eggs within the ovaries gradually decreases throughout life.

This decline begins before birth and continues until menopause.

Age is particularly important because fertility is influenced not only by the number of eggs remaining but also by egg quality.

As women become older, the proportion of eggs with chromosome abnormalities increases. This contributes to lower pregnancy rates and a higher risk of miscarriage.

Two of the most commonly used measures of ovarian reserve are:

• Anti-Müllerian hormone (AMH)
• Antral follicle count (AFC)

What Is AMH?

AMH is a hormone produced by cells surrounding small developing follicles within the ovaries.

A blood test can measure AMH and provide an indirect estimate of the pool of small follicles remaining.

Generally, a higher AMH suggests a larger ovarian reserve, while a lower AMH suggests fewer remaining follicles.

However, AMH results must always be interpreted in context.

A low AMH does not mean there are no eggs remaining, and it does not mean natural pregnancy is impossible.

Similarly, a high AMH does not guarantee fertility.

AMH is particularly useful when planning ovarian stimulation for IVF or egg freezing because it can help predict whether the ovaries are likely to produce a low, average or high number of follicles in response to medication.

What Is an Antral Follicle Count?

Antral follicles are small fluid-filled follicles that can be seen within the ovaries using ultrasound, usually early in the menstrual cycle.

During an ultrasound, the clinician counts the small follicles visible in both ovaries. This number is called the antral follicle count or AFC.

Like AMH, AFC provides information about ovarian reserve and likely response to ovarian stimulation.

AMH and AFC often correlate, although they do not always give identical results.

Your fertility specialist will interpret these measurements alongside your age, menstrual history, previous treatment and other clinical factors.

What Does Low AMH Mean?

A low AMH generally indicates that the number of remaining recruitable follicles is lower than expected.

This becomes more common with increasing age but can also occur in younger women.

Possible contributing factors include previous ovarian surgery, endometriosis, chemotherapy, radiotherapy and individual genetic variation. Sometimes there is no obvious explanation.

For someone undergoing IVF, lower ovarian reserve may mean fewer eggs are collected during a stimulation cycle.

However, low AMH does not automatically mean poor-quality eggs.

Age remains one of the strongest predictors of egg quality.

A younger woman with low AMH may still have good-quality eggs, although fewer eggs may be available during treatment.

What Does High AMH Mean?

A higher AMH generally indicates a larger number of small follicles within the ovaries.

High AMH is commonly seen in women with polycystic ovary syndrome (PCOS).

For IVF, a high ovarian reserve can mean that the ovaries respond strongly to stimulation medications.

This can be advantageous because more follicles may develop, but excessive ovarian response can increase the risk of ovarian hyperstimulation syndrome (OHSS).

Modern IVF protocols can substantially reduce this risk through individualised medication doses, GnRH antagonist protocols, appropriate trigger medication and, when indicated, freezing embryos for later transfer.

Can AMH Predict Natural Pregnancy?

This is one of the most important misconceptions about AMH.

AMH is not a fertility score.

A woman with low AMH may conceive naturally, while someone with a high AMH may experience infertility for completely unrelated reasons.

Natural conception depends on many factors, including:

• Ovulation
• Egg quality
• Sperm quality
• Fallopian tube function
• Uterine factors
• Timing of intercourse
• Age
• Other medical and reproductive factors

AMH is therefore only one part of a fertility assessment.

Does AMH Measure Egg Quality?

No.

AMH primarily provides information about egg quantity, rather than egg quality.

Female age remains a much stronger indicator of the likelihood of chromosome abnormalities within eggs.

This distinction is particularly important when discussing IVF.

For example, a 30-year-old woman with a low AMH may produce relatively few eggs during IVF, but those eggs still reflect her age-related probability of being chromosomally normal.

Conversely, a woman in her early 40s may have a relatively reassuring AMH but still experience the age-related decline in egg quality.

Can You Increase AMH?

Patients frequently encounter supplements, diets or treatments claiming to dramatically increase AMH or reverse ovarian ageing.

These claims should be approached cautiously.

Ovarian ageing cannot currently be reliably reversed, and an increase in an AMH laboratory result does not necessarily mean that additional eggs have been created.

Healthy lifestyle measures remain worthwhile for general and reproductive health, including avoiding smoking, maintaining an appropriate weight, exercising regularly and optimising medical conditions.

Any supplements should be discussed with your doctor, particularly during fertility treatment.

When Should Ovarian Reserve Be Tested?

Ovarian reserve testing may be useful if you:

• Have been experiencing difficulty becoming pregnant
• Are considering IVF
• Are considering egg freezing
• Have a history of ovarian surgery
• Have endometriosis
• Have received chemotherapy or pelvic radiotherapy
• Have a family history of premature menopause
• Have irregular or absent periods
• Have previously responded poorly to ovarian stimulation

Testing should ideally be performed for a clear clinical reason rather than simply obtaining a number without appropriate interpretation.

AMH and Egg Freezing

Ovarian reserve assessment can be particularly helpful when considering egg freezing.

AMH and AFC can help estimate how many eggs might be obtained from a stimulation cycle.

However, age at the time eggs are frozen remains extremely important because age is closely related to egg quality.

Therefore, decisions about egg freezing should not be based on AMH alone.

AMH and IVF

Before IVF, ovarian reserve testing helps the fertility specialist individualise the stimulation protocol.

Someone with a lower ovarian reserve may require a different approach from someone predicted to have a very high response.

The goal is not simply to produce as many eggs as possible. The aim is to achieve an appropriate ovarian response while maintaining patient safety.

The Take-Home Message

AMH and antral follicle count are valuable fertility tools—but they need to be interpreted correctly.

AMH mainly provides information about the quantity of remaining follicles and expected response to ovarian stimulation.

It does not directly measure egg quality, and it cannot tell an individual woman whether she will or will not become pregnant naturally.

Your age, medical history, ultrasound findings, sperm factors and overall reproductive circumstances all matter.

If you are concerned about ovarian reserve or planning to delay pregnancy, IVF or egg freezing, a fertility assessment can help put these numbers into context and allow you to make informed decisions about your reproductive future.