Two of the following three criteria must be fulfilled:
(i) A clinical diagnosis of oligomenorrhoea or amenorrhoea
(ii) Clinical or biochemical evidence of hyperandrogenism
(iii) Polycystic ovaries on ultrasound examination (either 12 or more follicles measuring 2–9  mm
in diameter, or an ovarian volume of >10 cm3)
Late onset congenital adrenal hyperplasia, androgen secreting tumours, and Cushing’s
syndrome must be excluded in women with raised androgens; thyroid disorders and raised
prolactin should be excluded in women with menstrual disturbances.
Algorithm 1: Revised 2003 criteria for diagnosing polycystic ovary syndrome (PCOS) [7].