Most of the other tests are useful only if the menstrual cycles are irregular.  Prolactin is a pituitary gland hormone that may rise in women with small benign growths of the pituitary gland and are on certain medications. Thyroid tests help to determine if there may be a problem with the thyroid. Testosterone, DHEAS and 17-hydroxyprogesterone are androgens (male hormones) that may be useful to check in women who also have excessive hair growth or PCOS. Women with PCOS are also screened for diabetes.