Up-to-date Definition of the Polycystic Ovary and Polycystic Ovary Syndrome

Abstract

Polycystic ovary syndrome (PCOS) is common in the general population. In this paper the author presents the up to date definition of PCOS and PCO. At a joint ASRM/ESHRE consensus meeting, a refined definition of the PCOS was agreed, in which two out of the following are required: (1) oligomenorrhoea or amenorrhoea; (2) clinical and/or biochemical signs of hyperandrogenism; (3) polycystic ovaries, once appropriate tests have been performed to exclude other causes of androgen excess and menstrual disturbance. The definition of a polycystic ovary (PCO) should have at least one of the following: either 12 or more follicles measuring 2–9 mm in diameter or increased ovarian volume (>10 cm³). If there is a follicle >10 mm in diameter, the scan should be repeated at a time of ovarian quiescence in order to calculate volume and area. The presence of a single PCO is sufficient to provide the diagnosis. The distribution of follicles and a description of the stroma are not required in the diagnosis.