How many thin women have pcos?

Common. Reportedly, 40% or so of pcos women are lean. Our belief is that a significant portion of the "lean pcos" group however, really falls into the hypothalamic ovulation disorder group. 3 hour glucose tolerance testing with insulins can sort this out. The hypothalamic group will have ultrasound findings, acne, oily skin etc to mimic the pcos patient, yet likely much lower risk of diabetes & met synd.