AMH and PCOS: What This Hormone Is Actually Telling You

What AMH Is Measuring (In Simple Terms)

AMH is produced by small, early-stage follicles in the ovaries.

These are the follicles that:
• Have started developing
• But have not yet matured or ovulated

In a typical cycle:
• A group of follicles begins developing
• One becomes dominant and ovulates
• The rest naturally regress

In PCOS, this process is disrupted.

Instead:
• Many follicles begin developing
• But fewer progress to full maturation
• Ovulation may not occur regularly

This leads to a build-up of these small, underdeveloped follicles.

And because each of these follicles produces AMH:

More follicles = higher AMH levels

Important Distinction: PCOS “Cysts” Are Not True Ovarian Cysts

This is where a lot of confusion happens.

The “polycystic ovaries” seen in PCOS are:
• Not true cysts
• Not large fluid-filled sacs
• Not harmful in the way ovarian cysts can be

They are actually:
• Many small, immature follicles sitting in the ovary

So when AMH is elevated in PCOS, it is largely reflecting:

A higher number of these small, stalled follicles - not cysts.

PCOS Has Different Types - And AMH Reflects That

PCOS is not one single condition. It is made up of different “types” based on how ovulation, hormones, and the ovaries are functioning.

These types are defined by three key features:
• Irregular or absent ovulation
• Elevated androgens (male-type hormones)
• The presence of many small follicles in the ovaries (often called polycystic ovaries)

Each type is simply a different combination of these features.

For example:
• Type A: All three are present (irregular ovulation, high androgens, and polycystic ovaries)
• Type B: Irregular ovulation and high androgens, but no polycystic ovaries
• Type C: High androgens and polycystic ovaries, but regular ovulation
• Type D: Irregular ovulation and polycystic ovaries, but no elevated androgens

When researchers compared AMH levels across these types, a clear pattern emerged:

• Highest AMH: Type A
• Next highest: Type D
• Moderate: Type C
• Lowest: Type B

The key takeaway is this:

AMH levels were most strongly influenced by the presence of many small follicles in the ovaries.

Even more than:
• Hormone levels like androgens
• Or visible symptoms

This reinforces that AMH is primarily reflecting what is happening inside the ovaries - particularly how many follicles are sitting in that early, not-yet-ovulated stage.

What This Means Biologically

AMH appears to reflect:

• How many follicles are sitting in the “waiting stage”
• How efficiently follicles are progressing toward ovulation
• The degree of ovulatory disruption

Higher AMH doesn’t just mean “more eggs”

It often means:

More follicles that are not completing the normal maturation process.

Why AMH Can Feel Confusing (And Sometimes Scary)

AMH is often interpreted through a fertility lens.

And while it can provide useful information in fertility settings, this study highlights something important:

AMH levels vary widely in PCOS and are influenced by ovarian behaviour - not just reproductive potential.

The research also found:
• Large variability between individuals
• Differences depending on testing methods
• No consistent universal “cut-off” values

This means AMH should always be interpreted in context - not in isolation.

AMH and Fertility: What This Study Suggests

The paper did not position AMH as a predictor of long-term fertility outcomes.

What it did show is that:

• Higher AMH is linked to more disrupted ovulation
• It may influence how someone responds to ovulation treatments

For example:
• Higher AMH was associated with lower response to some ovulation medications

This reflects ovarian behaviour - not a fixed measure of fertility.

Why This Research Matters

This study reinforces a more nuanced understanding of PCOS:

• It is not one condition
• It has multiple biological patterns
• Ovarian function varies between individuals

And importantly:

AMH is a reflection of what the ovaries are doing right now - not a definitive statement about the future.