While investigating a case of gynecomastia, all of the following hormone levels are estimated, EXCEPT:

While investigating a case of gynecomastia, levels of serum testosterone, LH, FSH, Estradiol and Beta hCG are estimated. Gynecomastia refers to enlargement of the male breast. It is caused by excess estrogen action and is usually the result of an increased estrogen/androgen ratio. Gynecomastia occurs as a normal physiologic phenomenon in the newborn (due to transplacental transfer of maternal and placental estrogens), during pubey (high ratio of estrogen to androgen in early stages of pubey), and with aging (increased fat tissue and increased aromatase activity). Ref: Harrison's Internal Medicine, 18th Edition, Page 3020, Chapter 346