PCOS Is Now PMOS: What the New Name Means for Your Hormones and Fertility

Written By Katie Krause

If you've been diagnosed with polycystic ovary syndrome, or wondered whether you have it, you may have seen headlines that it has a new name. In May 2026, an international consensus published in The Lancet renamed PCOS to polyendocrine metabolic ovarian syndrome, or PMOS. The change came after 14 years of global work involving 56 professional and patient organizations (MCHRI).

PMOS is common. It affects about 1 in 8 women of reproductive age, more than 170 million people worldwide, and up to 70% of those affected remain undiagnosed (MCHRI).

Why experts dropped the word "polycystic"

The old name suggested the ovaries are full of cysts. They aren't. What shows up on an ultrasound is a larger number of follicles that stopped developing, not true cysts (MCHRI). The name dates to the 1930s and was based on a surgical finding.

The old name also focused on the ovaries alone. Experts say that focus led to delayed diagnosis, fragmented care and stigma (MCHRI).

What PMOS actually is

The new name describes three parts of the condition:

  • Polyendocrine: several hormone systems are involved, including higher androgens (like testosterone).

  • Metabolic: insulin resistance is present in about 85% of people with the condition (MCHRI), which affects weight, energy and long-term heart and diabetes risk.

  • Ovarian: irregular or absent ovulation, which can make periods unpredictable and pregnancy harder to plan.

How PMOS is diagnosed, and where AMH fits

The diagnostic rules haven't changed. Under the international guideline, an adult is diagnosed when 2 of these 3 are present, after other causes are ruled out (2023 International PCOS Guideline):

  1. Higher androgens, seen on a blood test or as symptoms like excess hair growth or acne

  2. Irregular or absent ovulation

  3. Polycystic-looking ovaries on ultrasound, or a high AMH level

For adults, irregular cycles mean cycles shorter than 21 days, longer than 35 days, or fewer than 8 periods a year. Your doctor should also check TSH (thyroid), prolactin and 17-hydroxyprogesterone to rule out conditions that look similar (2023 International PCOS Guideline).

AMH can stand in for an ultrasound in adults, but the guideline says it should not be used as a single test for diagnosis, and not yet in teens.

Does the new name change my diagnosis or treatment?

No. The diagnostic criteria and treatment recommendations stay the same (MCHRI). The two names will be used side by side for about 3 years, and the 2028 international guideline will use PMOS alone. Your doctor may still say "PCOS" for a while, and that's fine.

Checking your hormones at home

If your cycles are irregular, a hormone test kit can give you clear numbers to bring to your doctor. The Novalynn PMOS Test Kit (previously named PCOS) measures testosterone, SHBG, LH, cortisol and the free androgen index, with one finger prick at home. To check AMH and thyroid as well, the Comprehensive Fertility Test Kit covers AMH, TSH and five more hormones.

A test kit can't diagnose PMOS on its own. Diagnosis also looks at your cycle history, symptoms and sometimes an ultrasound. Your results give you and your doctor a starting point.

Not sure which test kit fits? Take the 60-second quiz.

FAQs

Is PCOS still called PCOS? Both names are in use during a 3-year transition. PMOS will fully replace PCOS in the 2028 guideline.

Do I need a new diagnosis? No. If you were diagnosed with PCOS, you have PMOS. Nothing about your diagnosis or care changes.

Does PMOS mean I can't get pregnant? No. Irregular ovulation can make it harder, and many people with PMOS conceive, sometimes with treatment. Talk with your doctor about your plans.

Sources

This article is for education and isn't medical advice. Talk with your healthcare provider about your symptoms and results.

Katie Krause
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