Parathyroid hormone (parathyroid hormone) is one of the main regulators of calcium in the blood. This hormone is very useful information for: parathyroid disease (primary hyperparathyroidism, secondary hyperparathyroidism, autoimmune hypoparathyroidism), osteoporosis, calcium content disorders (hypercalcaemia, hypocalcaemia). Parathyroid hormone is a protein that is synthesized in the parathyroid glands. It main function is to regulate calcium metabolism in the body. When the level of calcium in the blood falls, the parathyroid hormone increases to raise the calcium concentration in the blood by sending signals to the bone to: 1. inhibit collagen synthesis in active osteoblasts; 2. activate osteolysis by osteocytes; 3. increase osteolysis by the osteoclasts; 4. increase in the rate of maturation of progenitor cells, differentiating into osteoblasts and osteoclasts. As a result, the calcium level in the blood rises. However, one of...