Parathormoon

Parathormone, also known as parathyroid hormone (PTH), is a polypeptide hormone produced by the parathyroid glands. It plays a crucial role in calcium homeostasis, the process by which the body maintains a constant level of calcium in the blood. PTH is released in response to low calcium levels in the blood, typically when the parathyroid glands detect a decrease in calcium through calcium-sensing receptors. The primary function of PTH is to increase calcium levels by stimulating the release of calcium from bones and the reabsorption of calcium in the kidneys. It also promotes the activation of vitamin D, which further aids in calcium absorption from the intestines. Hyperparathyroidism, a condition characterized by excessive PTH production, can lead to high calcium levels in the blood, a condition known as hypercalcemia. Conversely, hypoparathyroidism, characterized by insufficient PTH production, results in low calcium levels, or hypocalcemia. PTH levels are typically measured in blood tests to diagnose and monitor conditions related to calcium metabolism.