Do I need to fast before an AMH blood test?

No fasting is required. The test can be performed at any time of day and on any day of your menstrual cycle.

Can you increase your AMH level?

Generally, no. AMH declines naturally with age, and no clinically proven method exists to replenish your non-renewable ovarian reserve. The most effective approach is timely family planning.

How often should AMH be re-tested?

Retesting intervals depend on your age, baseline numbers, and reproductive goals. Your specialist will recommend whether and when follow-up testing is warranted.

What is AMH? The Hormone Test That Reveals Your “Ovarian Reserve” Before Family Planning

Kanwalat Chalertpet, Ph.D.

Oct 28

3 min read

Ever wondered how many eggs remain in your ovaries? Every woman is born with a finite supply of eggs, which naturally diminishes over time. The reassuring news is that you can assess your "ovarian reserve" through a single, straightforward AMH blood test. This information empowers you to make proactive, timely decisions regarding your fertility journey.

What is AMH?

AMH (Anti-Müllerian Hormone) is a hormone secreted by the granulosa cells of small, developing antral follicles in the ovaries. The greater the number of small follicles present, the higher the circulating AMH level. Consequently, this value serves as a reliable biological marker of your remaining ovarian reserve.

A major clinical benefit of the AMH test is its stability throughout the menstrual cycle. Unlike other reproductive hormones, it does not fluctuate significantly from week to week, allowing blood to be drawn on any day of the month without waiting for specific cycle milestones.

What Do Low, Normal, and High AMH Levels Indicate?

AMH Level (ng/mL)	Clinical Meaning	Recommended Action
Below Age-Expected Range (< 1.0 – 1.2)	Ovarian reserve is lower than average for your peer group	Consult a fertility specialist promptly to expedite family planning, or evaluate options such as egg freezing and IVF.
Within Age-Expected Range (1.5 – 4.0)	Ovarian reserve is well-aligned with chronological age	Proceed with standard family planning goals and monitor periodically as recommended by your physician.
Above Expected Range (> 4.0)	High pool of small follicles; often associated with PMOS (PCOS)	Undergo diagnostic testing for PMOS (PCOS).

Note: There is no universal "one-size-fits-all" normal value. Reference ranges decrease progressively with age, and testing platforms or units—ng/mL vs. pmol/L—can vary among laboratories. Your specialist will always interpret your results in the context of your age.

3 Common Misconceptions About AMH

AMH indicates egg quality — False. AMH measures only egg quantity (ovarian reserve). Egg quality is primarily driven by chronological age. A younger woman with low AMH can still possess high-quality eggs capable of healthy fertilization.
Low AMH means you cannot get pregnant — False. As long as spontaneous ovulation occurs monthly, natural conception remains viable because each cycle requires only one mature egg. A low AMH indicates that your biological window is narrowing, rather than that conception is impossible.
The higher the AMH, the better — Not necessarily. Very high AMH values frequently point to PMOS (PCOS), where an abundance of small follicles fails to mature, leading to anovulation and irregular cycles.

Who Should Get Tested and How to Prepare?

Who Should Consider an AMH Test:

Women aged 35 or older planning to conceive.
Couples unable to conceive after 12 months of trying (or 6 months if the female partner is 35 or older).
Individuals experiencing irregular, delayed, or absent periods suggestive of PMOS.
Women interested in elective egg freezing or proactive fertility preservation.
Individuals with a history of ovarian surgery, endometriomas, or exposure to chemotherapy or pelvic radiation.

Test Preparation:

Fasting is not required; the test can be conducted at any time on any cycle day.
Inform your physician if you are using oral contraceptives, as birth control pills can temporarily suppress AMH readings.

What Steps to Take If Your AMH is Low or High?

If AMH is Low: Do not panic, but avoid unnecessary delays. Consult a reproductive specialist to evaluate your AMH alongside an Antral Follicle Count (AFC) ultrasound and baseline reproductive hormones. Pathways may range from prioritizing natural conception and elective egg freezing to proceeding directly with IVF or ICSI.
If AMH is High: Your physician will assess whether you meet diagnostic criteria for PMOS (PCOS) through cycle history, androgen profiles, and pelvic ultrasound. If present, optimizing metabolic health and regulating ovulation will substantially increase your chances of pregnancy.

Why AMH is Crucial for IVF / ICSI

Prior to beginning an IVF or ICSI cycle, fertility specialists use AMH levels to forecast how your ovaries will respond to stimulation medications, allowing for tailored medication dosing:

Low AMH: Anticipates a lower egg yield. Specialists adjust stimulation protocols to maximize follicle recruitment safely.
High AMH: Anticipates a rapid, high ovarian response, elevating the risk of Ovarian Hyperstimulation Syndrome (OHSS). Physicians utilize lower starting doses and safety measures—such as a Freeze-All embryo transfer protocol—to ensure optimal maternal safety.

Customizing stimulation regimens using AMH data is fundamental to personalized reproductive medicine.

Know Your AMH Level Today: Plan Your Family in Time

Evaluate your AMH levels and map out your fertility journey with Siam Fertility Clinic, supported by an international-standard embryology laboratory and individualized clinical protocols.