生育地圖What is AMH? How to Interpret AMH Levels (Ovarian Reserve Indicator)
AMH (Anti-Müllerian Hormone) is a hormone secreted by the granulosa cells of small ovarian follicles and can be detected via a blood test. Its level reflects the quantity of small follicles in the ovaries, so it is often used to assess 'ovarian reserve.' It is important to note that AMH reflects the 'quantity' of eggs, not their quality, and does not equate to the ability to conceive naturally. Interpretation should be done by a physician in conjunction with age, ultrasound, and other tests. Another feature of AMH is that it is not affected by the menstrual cycle, allowing blood sampling at any time with relatively stable values. Generally, young women have levels around 2–5 ng/mL, which gradually decline with age. The following is a neutral information summary; actual interpretation and subsequent management should be based on a qualified physician's assessment.
Taiwan Society for Reproductive Medicine (TSRM) ↗
How to Interpret AMH Level Ranges? What Do They Mean?
Reference ranges vary slightly among laboratories. The table below provides a general reference (unit: ng/mL) for understanding purposes only and should not be used to draw conclusions based solely on the value.
| AMH Range (ng/mL) | Common Interpretation (Reference) |
|---|---|
| Approximately > 3.5–4.0 (High) | Higher small follicle reserve, sometimes associated with polycystic ovaries; treatment medication requires caution regarding ovarian hyperstimulation syndrome (OHSS) risk |
| Approximately 2.0–3.5 (Normal Range) | Ovarian reserve within common range |
| Approximately 1.0–2.0 (Borderline Low) | Reserve slightly below average; should be evaluated together with age |
| Approximately < 1.0 (Low) | Often used as a reference threshold for low ovarian reserve |
| Approximately < 0.5 (Significantly Low) | Indicates low small follicle reserve |
AMH reflects the 'quantity' aspect of eggs, not quality. A single value cannot be interpreted alone; it must be assessed by a physician in combination with age, ultrasound follicle count, and other tests. This section is a neutral information summary, not medical advice.
How Do AMH, FSH, and Antral Follicle Count (AFC) Differ in Assessing Ovarian Reserve?
Ovarian reserve is not assessed by a single number; clinically, multiple indicators are used complementarily.
| Indicator | How It Is Measured | Affected by Menstrual Cycle? | What It Reflects |
|---|---|---|---|
| AMH (Anti-Müllerian Hormone) | Blood test, any time | Almost unaffected | Quantity of small follicles in the ovaries |
| FSH (Follicle-Stimulating Hormone) | Blood test, usually on day 2–3 of menstruation | Significantly affected by cycle; requires specific timing | High levels may indicate decreased ovarian response |
| E2 (Estradiol) | Often drawn simultaneously with FSH | Affected by cycle | Helps correctly interpret FSH |
| AFC (Antral Follicle Count) | Transvaginal ultrasound in early menstruation | Performed at specific time | Number of visible small follicles at that time |
Each indicator has limitations and must be interpreted comprehensively by a physician; no single indicator should be used to draw conclusions. This section is a neutral information summary, not medical advice.
What Can AMH Not Tell You? Common Misinterpretations
AMH is a useful reserve indicator, but its scope is limited. Below are common misunderstandings:
- Does not reflect egg 'quality': Egg quality is more related to age; a high AMH does not mean good quality.
- Cannot alone predict natural conception: Low AMH may still allow natural pregnancy, and high AMH does not guarantee successful conception.
- Does not equal normal ovulation: Ovulation regularity depends on menstrual status and other tests, not AMH.
- Can be affected by certain conditions: Use of hormonal contraceptives or history of ovarian surgery may lower levels; inform your physician when interpreting.
- Differences in testing methods and units: 1 ng/mL is approximately equal to 7.14 pmol/L; confirm units and testing method before comparing values.
This section is a neutral information summary, not medical advice. Please rely on a qualified physician for interpretation.
When Is AMH Testing Recommended? What Should Be Noted Before Testing?
Due to its convenience and minimal influence from the menstrual cycle, AMH is often used in the following situations as part of an assessment:
- Preconception evaluation, understanding ovarian reserve and fertility planning timing
- Before planning egg freezing (oocyte cryopreservation)
- Before starting IVF or other treatments, to help physicians plan medication strategies
- Long-term irregular menstruation or suspected decreased ovarian function
- Evaluation before or after ovarian-related surgery
No special fasting is required before testing, nor does it need to be done on a specific day of the menstrual cycle. If you are taking hormonal contraceptives or have recently undergone related treatments, please inform your physician, as these may lower the value. In most cases, it is interpreted together with antral follicle count (AFC) via ultrasound.
This section is a neutral information summary, not medical advice.
FAQ
What is AMH? How is it tested?
AMH (Anti-Müllerian Hormone) is a hormone secreted by the granulosa cells of small ovarian follicles and can be detected with a single blood test. Because it reflects the quantity of small follicles in the ovaries, it is often used as an indicator to assess 'ovarian reserve.' Testing can be arranged at obstetrics and gynecology clinics or assisted reproductive institutions; no special fasting or specific timing is required.
What is a normal AMH level?
Generally, young women have AMH levels around 2–5 ng/mL, which gradually decline with age. Clinically, a level below approximately 1.0 ng/mL is often used as a reference threshold for low ovarian reserve. However, reference ranges vary slightly among laboratories, and a single value cannot be interpreted alone; it must be assessed by a physician in combination with age and other tests.
Is AMH affected by the menstrual cycle?
Relatively not. A feature of AMH is that its level is not significantly affected by the phase of the menstrual cycle, so blood can be drawn on any day of the cycle with minimal variation. This is one reason it is often used for stable assessment of ovarian reserve.
What does low AMH mean? Does it mean infertility?
Low AMH usually indicates a reduced quantity of available small follicles in the ovaries, reflecting the 'quantity' aspect of eggs. It does not directly equate to infertility or inability to conceive—low quantity does not mean poor quality. Whether further evaluation or early planning is needed should be determined by a physician based on age, ultrasound follicle count, and overall condition. This page is only a neutral information summary.
What does high AMH mean?
High AMH levels are sometimes associated with polycystic ovary syndrome (PCOS), as polycystic ovaries have a higher number of small follicles. However, a high level alone cannot diagnose any condition; it must be evaluated by a physician in conjunction with menstrual status, ultrasound, and other hormone tests.
What is the relationship between AMH and age?
AMH gradually declines with age, with a more noticeable decrease after age 35. This is why AMH is often used together with age to assess fertility planning timing. However, individual variation is significant; people of the same age can have very different AMH levels, so individual testing and physician interpretation are essential.
How is AMH testing related to egg freezing and IVF?
AMH is commonly used in pre-treatment assessments for egg freezing (oocyte cryopreservation) and in vitro fertilization (IVF) to help physicians understand ovarian reserve and plan treatment strategies and medication. For information on costs and procedures of egg freezing and IVF, please refer to the neutral summary pages on this site, such as 'How Are Egg Freezing Costs Calculated?' and 'IVF Treatment Process.'
How much does AMH testing cost? Where can it be done?
AMH testing can generally be arranged at obstetrics and gynecology clinics or assisted reproductive institutions licensed by the Ministry of Health and Welfare. Costs vary by institution (commonly ranging from a few hundred to over a thousand NTD; please refer to each institution's announcement). Some county/city egg freezing subsidies also cover AMH blood test fees; see the page 'Which Cities Offer Social Egg Freezing Subsidies?' on this site for details.
Further References (Official Data Sources)
· This page is a neutral compilation of information, for reference only, not medical advice, and does not constitute any treatment commitment. Actual regulations and treatments should be based on announcements from competent authorities and explanations from qualified physicians.
