You Are Taking Care of a 33-Year-Old Patient with a Diagnosis

You are taking care of a 33-year-old patient with a diagnosis of secondary amenorrhea. Her past medical, family, and psychosocial histories are not contributory. Her pregnancy test is negative, and she just had thyroid-stimulating hormone (TSH) and prolactin testing, which are normal. Your next step in the work-up of secondary amenorrhea for this woman will be to order:

A) Follicle-stimulating hormone and estradiol
B) MRI of sella turcica
C) Estradiol and free testosterone
D) Pelvic sonogram