What is parathyroid hormone (PTH)? | CENTER for Advanced Parathyroid Surgery

The parathyroid glands produce parathyroid hormone (PTH) to help regulate the amount of calcium in the blood stream. When calcium levels are low, the gland produces PTH which pours into the blood stream. The PTH eventually enters the bones and activates cells that reabsorb and remodel the bone, thereby releasing calcium into the blood. In addition, the hormone instructs the kidneys to abosrb calcium back from urine. Finally, it changes Vitamin D into its active form, which helps the intestines absorb calcium, thus increasing calcium in the blood.

Alternatively, when calcium levels are high, the gland shuts down and the PTH level decreases so no more calcium is created.

Dr. Babak Larian is a parathyroid specialist. To learn more about hyperparathyroidism call us at 310.461.0300.