Understanding Low AMH and What It Means for Fertility
Antimüllerian hormone, commonly known as AMH, is a hormone produced by cells in the developing follicles of the ovaries. An AMH blood test is often used as one of the markers of ovarian reserve, which refers mainly to the number of eggs remaining in the ovaries.
Hearing that your AMH level is low can naturally cause concern, particularly if you are planning a pregnancy. However, a low AMH level does not automatically mean that pregnancy is impossible. AMH provides information about ovarian reserve, but fertility depends on many factors, and age remains one of the most important predictors of reproductive potential.
What Is AMH?
AMH is produced by small developing follicles in the ovaries. Because the number of these follicles generally decreases with age, AMH levels also tend to decline throughout the reproductive years.
Unlike some other reproductive hormones, AMH can generally be measured at different points during the menstrual cycle. It is commonly used as part of an assessment of ovarian reserve, particularly when fertility treatment is being considered.
However, AMH should not be viewed as a simple "fertility score."
What Does a Low AMH Level Mean?
A low AMH level may suggest that the number of developing follicles in the ovaries is lower than expected for a particular age group or clinical situation.
It can be associated with diminished ovarian reserve (DOR).
Importantly, diminished ovarian reserve does not necessarily mean infertility. A woman with a low AMH level may still ovulate and become pregnant naturally. The American Society for Reproductive Medicine notes that ovarian reserve tests are better at predicting ovarian response to stimulation than predicting the likelihood of natural conception.
Does Low AMH Mean You Cannot Get Pregnant?
No.
This is one of the most important points women should understand.
AMH primarily provides information about egg quantity, not egg quality. Ovarian reserve and egg quality are different concepts.
Research reviewed by ASRM has found that ovarian reserve markers, including AMH, are poor independent predictors of reproductive potential. Women with lower AMH levels do not necessarily have a lower chance of conceiving in a given period compared with women with higher levels.
Therefore, an AMH result should always be interpreted alongside age, menstrual history, fertility history, other test results, and the overall clinical picture.
AMH and Age
Age is an important factor in fertility because both the number and quality of eggs change over time.
AMH generally decreases as ovarian reserve declines with age. However, women of the same age can have very different AMH levels and ovarian reserve.
This means that an AMH result should not be interpreted in isolation.
For example, two women with the same AMH level may have very different fertility circumstances because of differences in age, ovulation, reproductive history, sperm factors, fallopian tube health, and other factors.
Why Might AMH Be Low?
AMH naturally tends to decline with age, but a lower result can occur for several reasons.
Possible factors include:
- Increasing reproductive age
- Individual differences in ovarian reserve
- Previous ovarian surgery
- Certain medical treatments
- Chemotherapy or radiation that affects ovarian function
- Some conditions affecting the ovaries
However, the cause cannot always be determined from an AMH result alone.
Women who have been told they have a low AMH should discuss their individual medical history with a qualified fertility or gynecology professional.
How Is AMH Tested?
AMH is measured through a blood test.
One advantage of AMH testing is that it can generally be performed at different points during the menstrual cycle, unlike some other ovarian reserve tests that are typically performed during specific cycle days.
However, laboratory methods and reference ranges can vary. Hormonal contraceptives can also affect AMH levels in some women, so results need to be interpreted in context.
For this reason, it is not advisable to interpret a single number without considering the laboratory reference range and the individual's clinical circumstances.
What Other Tests May Be Used?
AMH is only one part of ovarian reserve assessment.
Depending on the situation, a healthcare professional may consider:
Antral Follicle Count
An antral follicle count (AFC) uses transvaginal ultrasound to count small follicles in the ovaries. AMH and AFC are considered among the more sensitive markers of ovarian reserve.
FSH and Estradiol
Blood tests measuring follicle-stimulating hormone (FSH) and estradiol may also provide additional information in certain circumstances.
Medical and Fertility History
A woman's age, menstrual cycle, previous pregnancies, duration of trying to conceive, previous fertility treatment, and other health factors are all important when evaluating fertility.
Low AMH and IVF
AMH can be particularly useful when planning assisted reproductive treatment.
A low AMH level may indicate that the ovaries could produce a lower number of eggs in response to ovarian stimulation. This information can help fertility specialists plan treatment and discuss realistic expectations.
However, AMH is not a reliable standalone predictor of pregnancy or live birth after IVF. Egg quality, age, sperm quality, embryo development, treatment protocols, and several other factors also influence outcomes.
Importantly, extremely low AMH should not automatically be used as a reason to deny someone fertility treatment.
Can Low AMH Be Increased Naturally?
There is no established lifestyle method that can reliably restore the number of eggs in the ovaries or permanently raise ovarian reserve.
Women may encounter supplements, diets, or treatments marketed as ways to "increase AMH" or "restore egg count." These claims should be approached cautiously.
A healthy lifestyle can support overall health, but it should not be presented as a way to reverse the natural decline in ovarian reserve.
Lifestyle Habits and Fertility
Although lifestyle habits cannot increase the number of eggs in the ovaries, maintaining overall health can be beneficial when planning pregnancy.
Helpful habits include:
- Eating a balanced and varied diet
- Maintaining regular physical activity
- Getting adequate sleep
- Avoiding tobacco
- Limiting alcohol
- Managing chronic health conditions
- Maintaining a healthy weight
- Managing stress in healthy ways
Women planning pregnancy should discuss supplements, medications, and existing health conditions with their healthcare professional.
Should Every Woman Get an AMH Test?
Not necessarily.
Professional guidance does not recommend using AMH as a general fertility test for women who have not been diagnosed with infertility. A single AMH measurement does not reliably predict how quickly a woman will become pregnant naturally.
AMH testing is more useful when it forms part of an appropriate fertility evaluation or when planning assisted reproductive treatment.
When Should You Consider a Fertility Evaluation?
Consider speaking with a healthcare professional if you are concerned about fertility, particularly if:
- You have been trying to conceive without success
- Your menstrual cycles are irregular or absent
- You have a history of ovarian surgery
- You have received chemotherapy or radiation
- You have a known reproductive health condition
- You have concerns about your reproductive plans
- You have previously received an abnormal ovarian reserve test
A fertility evaluation should consider both partners when applicable because fertility can be influenced by male as well as female factors.
What Should You Do After Receiving a Low AMH Result?
Receiving a low result can be stressful, but it is important not to make decisions based on the number alone.
A practical approach is to:
- Discuss the result with a qualified healthcare professional.
- Consider your age and reproductive goals.
- Review your menstrual and fertility history.
- Consider additional assessment such as AFC when appropriate.
- Discuss whether fertility treatment or further evaluation is appropriate.
- Avoid unproven treatments marketed as ways to restore ovarian reserve.
The right approach depends on your individual circumstances.
Low AMH Does Not Tell the Whole Fertility Story
Fertility is influenced by many factors, including:
- Age
- Ovulation
- Egg quality
- Sperm quality
- Fallopian tube health
- Uterine health
- Endometriosis and other reproductive conditions
- Overall health
- Duration of trying to conceive
AMH mainly provides information about ovarian reserve and expected ovarian response to stimulation. It cannot provide a complete picture of a woman's ability to become pregnant.
Final Thoughts
A low AMH result can be important information, particularly when evaluating ovarian reserve or planning fertility treatment, but it should not automatically be interpreted as a diagnosis of infertility.
AMH is primarily a marker of egg quantity, while fertility involves many other factors. Current evidence shows that AMH is useful for predicting ovarian response during fertility treatment but is a poor independent predictor of natural reproductive potential.
If you have received a low AMH result, the most useful next step is to discuss it with a qualified gynecologist or fertility specialist who can interpret the result alongside your age, medical history, menstrual pattern, reproductive goals, and other fertility assessments.
Understanding what an AMH result can and cannot tell you can help prevent unnecessary anxiety and support better-informed fertility decisions.
