T.S. is a 17-year-old high schooler who presents to her family doctor with concern about excess body hair that has developed in the past year (especially embarrassing are some hairs growing along the jawline). She plays varsity volleyball, which accounts for her solid muscular build, but she is concerned that she has missed two periods in the past 6 months. Name and describe a diagnosis that fits this case. Name and describe a diagnostic test that confirms your theory.