PMOS: the new name for PCOS
Key Takeaways
PMOS is the new consensus name for the condition previously called PCOS. The change is terminology, not a new diagnosis: an earlier diagnosis is not invalidated by the new name alone, and the word ‘cyst’ does not mean that the condition is defined by ovarian cysts. See the full guide for diagnosis and care.
Key evidence: Lancet — PMOS naming consensus (2026) 2023 International Evidence-based Guideline (Teede et al.) Monash University — PMOS guideline terminology update (2026)
What changed — and what did not
PMOS stands for polyendocrine metabolic ovarian syndrome. A 2026 international consensus selected it as the new name for the condition previously called polycystic ovary syndrome (PCOS). The revised name is intended to reflect the condition’s wider endocrine and metabolic features; it does not describe a new illness.
During the planned transition, medical records and laboratories may continue to use PCOS, or show both names together: PMOS (formerly called PCOS). The consensus describes a three-year transition, with integration planned for the 2028 update to the international guidelines as set out in The Lancet.
The name change does not create a new diagnosis. It does not, by itself, invalidate an earlier PCOS diagnosis or require you to change treatment. Monash says the May 2026 terminology update left the 2023 guideline’s recommendations and content unchanged; the next international guideline update in 2028 will use PMOS as standard.
For detailed information about diagnosis, treatment, fertility and IVF, see the full PCOS/PMOS guide.
Why was “PCOS” misleading?
The old name can give the impression that ovarian cysts define the condition. In the ultrasound description, “polycystic” refers to the appearance of many small follicles; it is not the same as finding a pathological ovarian cyst that needs surgery. The 2023 guideline describes this follicle pattern. A separate ovarian cyst is assessed on its own; read more about functional ovarian cysts.
What should patients do during the transition?
You do not need to repeat tests or change treatment solely because the name has changed. If a medical record uses a term you do not recognise, ask your clinician whether it refers to the same diagnosis and whether anything in your care plan actually needs to change.
FAQ
Is PMOS the same as PCOS?
Yes. PMOS is the new international consensus name for the condition historically called PCOS. Both terms will continue to appear together in medical practice during the transition period.
Does PCOS mean I have ovarian cysts that need surgery?
No. In this name, “polycystic” refers to an ultrasound pattern of many small follicles. The term alone does not mean that you have a pathological ovarian cyst or need surgery. A separately identified cyst can be assessed on its own.
Will my previous PCOS diagnosis still be valid?
The new name alone does not invalidate a previous diagnosis. Records may use both terms during the transition; ask your clinician if you are unsure what a record means.
Sources
- Teede HJ, Bahri Khomami M, Morman R, et al. Polyendocrine metabolic ovarian syndrome, the new name for polycystic ovary syndrome: a multistep global consensus process. Lancet. 2026;407(10545):2329–2339. doi:10.1016/S0140-6736(26)00717-8. PMID: 42119588.
- Teede HJ, Tay CT, Laven JJE, et al. Recommendations from the 2023 International Evidence-based Guideline for the Assessment and Management of Polycystic Ovary Syndrome. Fertil Steril. 2023;120(4):767–793. doi:10.1016/j.fertnstert.2023.07.025. PMID: 37589624.
- Monash Centre for Health Research and Implementation. International Evidence-based Guideline: May 2026 terminology update for PMOS. 2026.
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The content has been created by Dr. Senai Aksoy and medically approved.