If you’ve been following fertility news lately, you may have heard about a significant shift in how the medical community talks about Polycystic Ovary Syndrome, better known as PCOS. My name is Dr. Carolyn Alexander and I’m proud to share that I was part of the committee and voting team that approved the new name: PMOS, or Polyendocrine Metabolic Ovarian Syndrome.

This isn’t just a name change. It’s a reframing of how we understand, diagnose, and treat one of the most common hormonal conditions affecting women of reproductive age, and it has real implications for your fertility journey.

THE REFRAME

Why the old name had to change?

The old name, Polycystic Ovary Syndrome, put all the focus on one thing: the appearance of the ovaries on ultrasound, those characteristic “cysts” clustered along the ovarian cortex. The problem? That picture is only one piece of a much bigger story.

PMOS shifts the lens toward what’s really driving the condition: metabolic function. Specifically, it recognizes the role of the ovaries, the adrenal glands, and the body’s broader hormonal system working (or not working) in concert.

WHAT PMOS TARGET	CLINICAL SIGNIFICANCE
INSULIN RESISTANCE Primary driver	A metabolic predisposition that disrupts hormone balance and ovulation in many patients.
CARDIOVASCULAR RISK Elevated risk	Women with PMOS have increased lipid abnormalities and heart disease risk — making proactive cholesterol screening part of the conversation.
DISRUPTED OVULATION Most common compliant	Affects 15–20% of reproductive-age women. The new name helps us explain — and treat — the root cause more precisely.

THE SCIENCE

Why ovulation gets disrupted

Here’s where it gets a little technical, but understanding this can be genuinely empowering.

In patients with PMOS, there’s often a chronic elevation of luteinizing hormone (LH), produced by the pituitary gland. Normally, LH spikes mid-cycle, that surge is what triggers the egg’s final maturation and release from the follicle. But when LH is chronically elevated, the body loses the ability to produce that critical surge. The signal gets lost in the noise.

For some patients, this is why we use a medication called a trigger shot, it gives the body the hormonal push it needs to ovulate properly.

There’s a second phenotype worth knowing about. In some women with PMOS, the theca cells in the ovaries produce excess testosterone, flooding the micro-environment around the developing egg. In these cases, we may consider suppressing androgens for a period before pursuing pregnancy — to improve conditions for the egg before we help it along.

“When there’s chronic LH elevation, the signal for proper ovulation is hindered. The trigger shot gives the body the push it needs to do what it’s trying to do naturally.”

— Dr. Carolyn Alexander, MD  |  Reproductive Endocrinology & Infertility, SCRC

THE PROLACTIN CONNECTION

A question from our Instagram Live

One question that came up during our session: “Why do women with PMOS sometimes have high prolactin?”

Prolactin is another pituitary hormone, and when it rises, it can interfere with ovulation. It can climb for several reasons: stress, certain medications, or a pituitary adenoma, a small benign growth on the pituitary gland.

Elevated prolactin also stimulates the adrenal gland, which can raise male hormone levels, sometimes showing up as unwanted facial hair or other signs of excess androgens.

If prolactin is elevated and you’re trying to conceive, we take it seriously. That typically means a conversation with an endocrinologist, possible medication, and often a pituitary MRI, especially important if there’s a larger adenoma, since pregnancy itself can increase pressure in that area and visual monitoring becomes essential.

YOUR EVALUATION FRAMEWORK

Questions to bring to your doctor

Not every PMOS case looks the same. When I sit with a patient, I’m looking at the full picture, total and free testosterone, DHEAS, FSH-to-LH ratio, and AMH levels. A very high AMH can itself be a signal of PMOS-related inflammation. The right approach depends entirely on your specific hormonal profile.

1

Why am I not ovulating?

The most common PMOS question — and the answer depends on your specific hormonal phenotype. Chronic LH elevation, elevated androgens, and insulin resistance each require different management.

2

Should I have my lipid panel checked?

Yes — cardiovascular health is now formally part of the PMOS conversation. Proactive cholesterol monitoring and cardio exercise are meaningful interventions, not just lifestyle advice.

3

Is my prolactin level part of the picture?

If you have irregular cycles or signs of elevated androgens, ask specifically about prolactin and whether a pituitary MRI is warranted.

4

What is my AMH, and what does it mean in my case?

A very high AMH can signal PMOS-related inflammation, not just high ovarian reserve. Context matters — ask your doctor to interpret it alongside your full hormone panel.

5

Do I need a trigger shot to ovulate properly?

If you’re not ovulating mid-cycle despite normal-appearing ultrasounds, chronic LH elevation may be the culprit. A trigger shot is one tool to help the body complete the process.

BOTTOM LINE

Numbers inform the decision — they don’t make it

The most important shift with PMOS is this: no two cases are the same, and the new name invites us to treat them that way. For the millions of women who have felt confused, dismissed, or reduced to a picture of their ovaries on an ultrasound, this shift is for you. PMOS gives us a richer, more accurate framework to understand what’s happening in your body and how to help.

What you can do right now, regardless of where you are in your journey: get your lipid panel checked, prioritize cardio exercise, pay attention to nutrition, and go into appointments prepared with your labs and your questions.

Medical disclaimer: This article is intended for general educational purposes only and does not constitute medical advice. PMOS/PCOS presentations vary significantly based on individual patient factors. Consult a board-certified reproductive endocrinologist for a personalized assessment of your fertility treatment options.