Table 1.

Diagnostic criteria of PCOS according to different definitions.

	NIH (1990) necessary 2 criteria	Rotterdam criteria (2003) necessary at least 2 criteria	Androgen Excess PCOS Society (2009) necessary at least 2 criteria
Clinical hyperandrogenism or biochemical hyperandrogenism	Obligatory presence	Possible presence	Obligatory presence
Oligo/anovulation may manifest with frequent or infrequent bleeding, respectively, at <21 days or >35 days Rarely cycles may be anovulatory despite regular bleeding	Obligatory presence	Possible presence	Possible presence
Ultrasound polycystic ovarian features: presence of 12 or more follicles 2–9 mm in diameter and/or increased ovarian volume >10 mL (without dominant follicle) in either ovary	—	Possible presence	Possible presence