Endocrinology, a branch of medicine deals with the study of structural and functional elements of the endocrine system. This system comprises endocrine glands (thyroid, adrenal, pituitary and others) and secretory organs (pancreas, hypothalamus) that release hormones directly into the blood stream and regulate the body functioning. Endocrine testing market is studied by three major segments namely, by test, by diagnostic technologies and by end users. The test segment is further classified into 11 major hormone tests that includes estradiol (E2), Follicle Stimulating Hormone (FSH), Human Chorionic Gonadotropin (hCG), Luteinizing hormone (LH), Dehydroepiandrosterone sulfate (DHEAS), progesterone, testosterone, Thyroid Stimulating Hormone (TSH), prolactin, cortisol and insulin tests.