The PCOS diagnostic standard requiring 2 of 3 features after other causes are excluded.
Why it matters for PCOS
The Rotterdam criteria (2003) are the most widely used framework for diagnosing PCOS. A diagnosis is made when at least 2 of these 3 features are present: irregular or absent ovulation (irregular periods), signs of excess androgens (clinical, such as acne and excess hair, or on blood tests), and polycystic ovaries seen on ultrasound. Because there are three possible combinations, two women can both have PCOS yet look quite different.
PCOS is a diagnosis of exclusion. Before the criteria are applied, a doctor needs to rule out other conditions such as thyroid problems, high prolactin, or congenital adrenal hyperplasia, which can mimic the same symptoms.
This glossary is education, not diagnosis. For your own situation, ask a doctor or pharmacist.