What Is the Normal Level of PTH in the Blood?


Quick Answer

The normal level of PTH in the blood is 10 to 55 picograms per milliliter, states MedlinePlus. PTH stands for parathyroid hormone, a protein hormone secreted by the parathyroid glands.

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Full Answer

PTH helps regulate the amount of phosphorus and calcium in the blood, according to WebMD. Lower-than-normal levels of PTH are caused by cancer, low magnesium levels, excess vitamin D intake and autoimmune diseases, reports MedlinePlus. Radiation and surgical trauma to the parathyroid glands also cause lower-than-normal PTH levels in some people. An elevated PTH level is associated with chronic kidney disease, calcium deficiency, parathyroid tumors and swelling of the parathyroid glands. Some women who are pregnant or breastfeeding have elevated PTH levels, but this is not a common occurrence.

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