AMH and ovarian reserve tests

AMH (Anti-Müllerian Hormone) is a hormone produced by the cells in your ovarian follicles - the small fluid-filled sacs in your ovaries that contain developing eggs.

Key facts about AMH:

• It's produced by the granulosa cells of small antral and pre-antral follicles
• AMH levels reflect the size of your remaining egg pool (ovarian reserve)
• Levels can be tested at any time during your menstrual cycle
• AMH naturally declines with age as egg supply diminishes

Why AMH testing matters:

AMH provides a snapshot of your ovarian reserve - essentially, an estimate of how many eggs you have left. This information can be useful for:

• Understanding your fertility potential
• Planning fertility treatment timing
• Predicting response to IVF medications
• Making informed family planning decisions

Important distinction:

AMH measures quantity (how many eggs you have), not quality (how healthy those eggs are). A normal AMH level doesn't guarantee fertility, and a low AMH doesn't mean you can't conceive. Egg quality is primarily related to age and cannot be directly measured.

AMH results are typically reported in either pmol/L or ng/mL, depending on your location. Here's a general guide to interpretation:

Normal ranges by age (approximate):

| Age | Low (pmol/L) | Normal (pmol/L) | High (pmol/L) |

| 25-30 | <10 | 15-40 | >40 |

| 30-35 | <7.5 | 10-30 | >30 |

| 35-40 | <5 | 7.5-25 | >25 |

| 40-45 | <2.5 | 5-15 | >15 |

Converting units: To convert from pmol/L to ng/mL, divide by 7.14.

What low AMH suggests:

• Fewer remaining eggs than average for your age
• You may produce fewer eggs during IVF stimulation
• Fertility treatment sooner rather than later may be advisable
• It does NOT mean you can't conceive naturally

What normal AMH suggests:

• Average number of eggs for your age
• Expected response to fertility medications
• Good candidates for egg freezing if considering it

What high AMH suggests:

• Greater than average egg supply
• May indicate PCOS (if very high)
• Strong response expected to IVF medications (may need lower doses to avoid overstimulation)

Variation in results:

AMH levels can vary slightly between tests and laboratories. A single result should be interpreted in context with other factors.

Understanding the limitations of AMH testing is crucial for interpreting results appropriately:

AMH does NOT measure:

Egg quality - This is primarily determined by age. A 38-year-old with high AMH still has 38-year-old eggs, with associated quality considerations.

Your ability to conceive naturally - Women with low AMH conceive spontaneously regularly. AMH doesn't predict natural fertility well.

Your fertility timeline - A low AMH doesn't mean you'll enter menopause soon. It indicates current egg supply, not the rate of decline.

Whether you'll have a successful pregnancy - Many factors beyond ovarian reserve affect pregnancy outcomes.

Common misconceptions:

• "Low AMH means I can't get pregnant" - Not true. Many women with low AMH conceive naturally.
• "Normal AMH means I have plenty of time" - Not necessarily. AMH doesn't account for egg quality.
• "High AMH means I'm very fertile" - High AMH may indicate PCOS, which can actually cause fertility challenges.

What AMH is best for:

• Predicting response to IVF stimulation
• Identifying women who may benefit from lower or higher medication doses
• Identifying potential PCOS when very high
• One piece of the fertility puzzle, not the complete picture

The bottom line:

AMH is a useful tool, but it should always be interpreted alongside other factors including age, partner factors, overall health, and other test results.

Receiving news of low AMH can be distressing, but it's important to understand what this means and what your options are:

First, don't panic:

Low AMH indicates fewer eggs, but:

• You only need one good egg to conceive
• Natural conception remains possible
• Many women with low AMH have healthy pregnancies
• Treatment options are available

Consider seeking specialist advice:

A fertility specialist can:

• Interpret your results in context
• Perform additional testing (FSH, antral follicle count)
• Discuss your personal situation and goals
• Outline treatment options if needed

Potential implications for treatment:

• You may respond less strongly to IVF medications
• Protocols may need to be adjusted
• More cycles might be needed to collect enough eggs
• Earlier treatment may be advisable if you're planning assisted conception

Options to consider:

If you're trying naturally: Continue trying. Low AMH doesn't mean you can't conceive naturally. Consider seeking help if you haven't conceived after 6 months (instead of the usual 12).

If you're not ready for pregnancy: Egg freezing while you still have eggs is worth considering. A fertility consultation can help you understand if this is advisable.

If you're planning IVF: Your clinic will adjust protocols to optimise your response. Success is still possible, though potentially with more cycles.

Lifestyle factors:

Some evidence suggests that reducing stress, eating well, not smoking, and maintaining a healthy weight may support egg health, though the impact on AMH itself is limited.

Very high AMH levels are often associated with Polycystic Ovary Syndrome (PCOS), one of the most common causes of fertility challenges:

The connection:

PCOS causes an accumulation of small follicles in the ovaries. Since these follicles produce AMH, women with PCOS often have elevated AMH levels - sometimes 2-3 times higher than average.

What high AMH in PCOS means:

• You have many follicles (eggs) in your ovaries
• This sounds positive, but these follicles may not develop normally
• Ovulation may be irregular or absent
• You may be at risk of overstimulation during fertility treatment

Other indicators of PCOS:

• Irregular or absent periods
• Signs of excess androgens (acne, excess hair growth)
• Polycystic-appearing ovaries on ultrasound

Fertility implications:

PCOS is the most common cause of anovulatory infertility (not ovulating regularly), but it's also very treatable:

• Lifestyle modifications can restore ovulation in some cases
• Medications like letrozole or clomiphene can induce ovulation
• IVF success rates are often good due to high egg numbers
• Careful medication dosing is needed to prevent ovarian hyperstimulation

If you have high AMH:

If your AMH is significantly above the normal range for your age, discuss with your doctor whether PCOS evaluation is appropriate. Early diagnosis and management can help address fertility challenges proactively.