News
11 May 2026
11 May 2026
Monash IVF’s very own and NSW Medical Director, Dr Michael Costello is one of ten members of an International PCOS Name Change Steering Committee which has led this global change that’s making waves in the industry.
PCOS, or Polycystic Ovary Syndrome, as it used to be called is a whole-body condition, not just a reproductive one, as suggested by the name PCOS. This condition impacts metabolic health, hormones, fertility and mental health, but the old name PCOS reflected only the ovaries.
This mismatch has caused confusion for patients and clinicians alike, hence the global push to introduce a new and more accurate name.
The new name, formerly known as PCOS will be PMOS
PMOS is a better reflection of the condition because of these reasons:
This isn’t the first time the condition ‘PCOS’ has undergone a name change. The condition was initially known as Stein-Leventhal Syndrome, named after two gynaecologists from Chicago USA who published a landmark paper in 1935. This was the first publication to describe the clinical triad of polycystic ovaries and amenorrhea and clinical hyperandrogenism (being hirsutism) in a case series of seven women.
How exactly the name was changed to PCOS is unclear, but it seems to have evolved rather than being the product of any formal deliberations. The term PCOS began to be used by some in 1950s and began to dominate in the 1990s.
The name ‘PCOS’ did not reflect the full effects of the condition. This isn’t just one opinion but was mandated in an international study authored by Dr Michael Costello and other health professionals and patients who surveyed over 4000 women with PCOS and approximately 3500 health professionals across six continents.
86% of patients with PCOS and 76% of health professionals supported changing the name to better reflect the full spectrum of the condition (Findings published in The Lancet).
There should be a shift in correctly diagnosing this condition as the reason for infertility as it is very important to get the diagnosis right so that the best treatment can be then advised.
The new name has now been announced in the landmark Lancet publication by lead author, Professor Helena Teede (Director of Monash Centre for Health Research Implementation) and co-authored by Dr Michael Costello (NSW Medical Director at Monash IVF), which you can read here.

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