Tracy is a 27 year old female who has come to see you with concerns about excessive body hair making her feel very self-conscious. She reports that she has always been ‘hairy’ but recently even more so, especially on her face, neck and back. She has tried over the counter hair removal creams, waxing and shaving but feels this is making the re-growth worse. Systems review highlights that Tracy also has long-standing oligomenorrhea with periods every three to four months. Her BMI is 34. Tracy is otherwise fit and well, a non-smoker and drinks 4 units of alcohol a week.
Given the likely cause of hirsutism is Polycystic Ovary Syndrome (PCOS), which one of the following set of tests would be most appropriate to request to support the diagnosis?