Anti-Müllerian hormone (AMH) testing has become one of the more commonly discussed fertility assessments for women over 35. If you’ve heard the term “ovarian reserve” in the context of fertility, AMH is one of the primary markers used to evaluate it. Understanding what this test measures—and, importantly, what it doesn’t measure—can help frame conversations with a healthcare provider.
One of the most important things to understand about AMH is that it provides information about the quantity of eggs remaining, but not their quality. Egg quality is generally considered a more significant factor in fertility after 35, which means an AMH result, while informative, is only one piece of a broader fertility picture.
What AMH Measures
AMH is a hormone produced by the granulosa cells in developing follicles in the ovaries. Because it’s produced by follicles that are actively developing, it reflects the remaining pool of eggs—often referred to as ovarian reserve. Unlike many other hormonal markers, AMH levels remain relatively stable throughout the menstrual cycle and can be tested on any day of the cycle, which makes it practically convenient for assessment.
According to research reviewed by the American College of Obstetricians and Gynecologists (ACOG), AMH levels tend to decline with age, reflecting the natural decrease in follicle numbers over time. However, what constitutes a “low,” “normal,” or “high” AMH level for a particular woman depends on her age and individual circumstances.
How AMH Levels Change After 35
Research consistently shows that AMH levels decline as women age, with the decline becoming more noticeable in the mid-to-late 30s. However, there is substantial variation among individuals—some women in their late 30s maintain AMH levels similar to women a decade younger, while others experience earlier declines. This variability is one reason why interpreting an AMH result requires context beyond a simple number.
Age-specific reference ranges exist, and most laboratories and fertility clinics compare a woman’s AMH to ranges typical for her age group. An AMH that would be considered low for a 25-year-old might be within the expected range for a 38-year-old. This contextual interpretation is one reason why discussing results with a reproductive specialist—rather than relying solely on a direct-to-consumer test—is generally recommended.
What AMH Can and Cannot Tell You
What AMH Can Suggest
AMH testing can provide useful information about ovarian reserve and may help predict how a woman might respond to ovarian stimulation for assisted reproductive technologies like IVF. Women with lower AMH may produce fewer eggs during a stimulation cycle, which can inform treatment planning. AMH can also sometimes provide early signals that ovarian reserve is declining faster than typical for age, which may be relevant for family planning discussions.
What AMH Cannot Tell You
AMH cannot predict with certainty whether or when a woman will conceive, naturally or with assistance. It does not measure egg quality—which is influenced by factors including age, genetics, and lifestyle—and egg quality is generally considered more important for conception and healthy pregnancy than egg quantity alone. AMH also cannot tell you how much time you have to conceive, despite how it is sometimes characterized in popular media. Many women with low AMH for their age conceive naturally.
For women who are tracking their ovulation and trying to conceive, understanding that AMH is a measure of quantity rather than quality can help frame its significance more accurately.
When AMH Testing Might Be Considered
AMH testing is often included as part of a broader fertility evaluation, which might also include antral follicle count (AFC) via transvaginal ultrasound, FSH and estradiol levels on day 3 of the cycle, and a general gynecological assessment. It’s commonly recommended when:
- A woman over 35 has been trying to conceive for six months or more without success
- A woman is considering fertility preservation (egg freezing) and wants to understand her current ovarian reserve
- A woman has a history of ovarian surgery, endometriosis, or other conditions that may affect ovarian reserve
- There is a family history of early menopause
- A fertility specialist recommends it as part of a pre-treatment evaluation
Direct-to-consumer AMH tests are also available, but interpreting results without clinical context can sometimes cause unnecessary anxiety or, conversely, false reassurance. A reproductive endocrinologist can provide proper interpretation and next steps.
Moving Forward After an AMH Test Result
If an AMH result comes back lower than expected for your age, it’s understandable to feel concerned. However, a low AMH does not mean that natural conception is impossible. Many women with lower ovarian reserve conceive without medical assistance, and for those who pursue fertility treatment, a reproductive endocrinologist can discuss what the result means for potential treatment options and response to stimulation.
Conversely, a normal or high AMH result is reassuring in terms of ovarian reserve but doesn’t guarantee easy conception—egg quality, partner factors, uterine health, and other variables all play roles. The most productive approach is to use AMH as one data point in a broader conversation with a healthcare provider about your individual fertility picture.
Frequently Asked Questions
At what age does AMH typically start to decline noticeably?
AMH begins to decline gradually from a woman’s early 20s onward, with the decline generally becoming more pronounced in the mid-to-late 30s and accelerating further in the 40s. However, individual variation is significant—some women maintain higher AMH levels longer than others. Age-specific reference ranges exist for this reason.
Can I improve my AMH levels?
Currently, there is no well-established medical intervention proven to significantly increase AMH levels, as it largely reflects the number of remaining follicles—a quantity that naturally decreases over time. Some research has explored whether factors like vitamin D deficiency correction or DHEA supplementation might have modest effects, but evidence is limited and any supplementation should be discussed with a healthcare provider rather than undertaken independently.
Is AMH testing covered by insurance?
Insurance coverage for fertility testing, including AMH, varies considerably by plan, state, and individual circumstances. Some insurers cover AMH as part of a fertility evaluation for women with defined infertility, while others may not. Checking with your insurance provider and discussing coding with your doctor’s office can help clarify what might be covered in your situation.
Should I get an AMH test even if I’m not actively trying to conceive?
Some women pursue AMH testing proactively as part of fertility planning, particularly if they’re considering delaying pregnancy. While it can provide useful information, it’s worth understanding the limitations—AMH doesn’t provide a definitive timeline and results can cause unnecessary anxiety without proper clinical guidance. If you’re considering this type of testing for planning purposes, discussing it with your gynecologist first can help you decide whether it’s appropriate and how to interpret results.
Key Takeaways
- AMH measures ovarian reserve (egg quantity), not egg quality—quality is generally the more important factor for conception and healthy pregnancy after 35.
- AMH levels naturally decline with age, with significant individual variation; age-specific reference ranges matter for interpretation.
- AMH is one data point in a broader fertility picture—it cannot definitively predict whether or when conception will occur.
- Women with lower AMH often do conceive naturally or with assistance; a low result warrants consultation, not despair.
- Interpreting AMH results with a reproductive specialist provides the most meaningful context for your individual situation.
Medical Disclaimer
This content is for informational purposes only and does not constitute medical advice. Individual health situations vary significantly. Always consult a qualified healthcare provider before making decisions related to your health, fertility, or pregnancy.
About the Author
Emily Carter is a women’s health writer focused on fertility, pregnancy after 35, and sleep changes in midlife. She writes research-informed, non-alarmist content to help women navigate reproductive and hormonal transitions with clarity and confidence.