Blood Vessel Function in Adolescents and Women With Polycystic Ovary Syndrome

The purpose of this study is to determine if changes in blood vessel health lead to the menstrual irregularities that women with PCOS experience. This research study will help determine if women with PCOS have early changes in their blood vessels called "endothelial dysfunction," and if the number of progenitor cells (cells that in a healthy person repair blood vessel damage) are related to these blood vessel changes. To do so, we will compare ultrasound (soundwave) pictures of a large blood vessel in the arm and the results of blood tests between women with PCOS and other healthy women with normal menstrual periods.