Parathyroid glands are 2-3 mm in size, located behind thyroid glands, and there are normally 4 glands locating 2 on the left and 2 on the right. Parathyroid hormone is briefly defined as parathormone (PTH). There may be some problems (such as hypoparathyroidism, hyperparathyroidism) associated with parathyroid glands which play important role in our general