Additional blood tests that are commonly done (to exclude specific etiologies) include Follicle-stimulating hormone (ovarian insufficiency); if the level is high, it should be remeasured monthly at least twice Thyroid stimulating hormone (thyroid disease) Prolactin (if the level is high [hyperprolactinemia], it should be remeasured) Total serum testosterone or dehydroepiandrosterone sulfate (PCOS or other causes of hirsutism or virilization) Amenorrhea with high follicle-stimulating hormone (FSH) levels (hypergonadotropic hypogonadism) suggests ovarian dysfunction.