Commencing with an introduction to the Endocrine system (both male and female), the chapter goes on to talk about the Pituitary Gland (Anterior lobe – Growth hormone, TSH, FSH, LH, ACTH, PRL; Intermediate Lobe – MSH; Posterior Pituitary – ADH, Oxytocin) and disorders related to them. Next are given Hypothalamus, Adrenal gland cortex (mineralocorticoids, glucocorticoids- cortisol, ACTH, ) and adrenal medulla. An exhaustive write up on Thyroid and its function tests is included. Presented next are Parathyroid hormone, Pancreas and its hormone – insulin, Testes along with its hormones, Ovary along with related hormones. Pineal gland is presented briefly. An exhaustive write up is presented on Hormones and infertility – that includes male infertility and female infertility. The hormones covered in the chapter are Aldosterone, , 17 Ketosteroids, Testosterone, DHEAS, OESTRIOL, 17-beta-OESTRADIOL, Delta 4 androstenedione, Progesterone, 17 Alpha Hydroxy Progesterone, Total T3, Total T4, Free T3, Free T4, LH, FSH, hPRL, Insulin, hCG, C-peptide. Many of these hormones are covered along with their complete commercial testing protocols while all are given along with their related pathologies at least. Also mentioned are Thyroid Antibodies.