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Parathyroid hormone (PTH) blood test

  • Definition
    • The PTH test measures the level of parathyroid hormone in the blood.

      PTH stands for parathyroid hormone. It is a protein hormone released by the parathyroid gland.

      A laboratory test can be done to measure the amount of PTH in your blood.

  • Alternative Names
    • Parathormone; Parathormone (PTH) intact molecule; Intact PTH

  • How the Test is Performed
  • How to Prepare for the Test
    • Ask your health care provider if you should stop eating or drinking for some period of time before the test. Most often, you will not need to fast or stop drinking.

  • How the Test will Feel
    • When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or slight bruising. This soon goes away.

  • Why the Test is Performed
    • Parathyroid hormone (PTH) is released by the parathyroid glands. The 4 tiny parathyroid glands are located in the neck, near or attached to the back side of the thyroid gland. The thyroid gland is located in the neck, just above where your collarbones meet in the middle.

      PTH controls calcium, phosphorus, and vitamin D levels in the blood. It is important for regulating bone growth. Your provider may order this test if:

      To help understand whether your PTH is normal, your provider will measure your blood calcium at the same time.

  • Normal Results
    • Normal values are 10 to 55 pg/mL.

      Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different specimens. Talk to your provider about the meaning of your specific test results.

  • What Abnormal Results Mean
  • Risks
    • Veins and arteries vary in size from one person to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

      Other risks associated with having blood drawn are slight, but may include:

      • Excessive bleeding
      • Fainting or feeling lightheaded
      • Hematoma (blood accumulating under the skin)
      • Infection (a slight risk any time the skin is broken)
  • References
    • Bringhurst FR, Demay MB, Kronenberg HM. Hormones and disorders of mineral metabolism. In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM, eds. Williams Textbook of Endocrinology. 13th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 28.

      Chernecky CC, Berger BJ. Parathyroid hormone (PTH) - Blood. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures. 6th ed. Philadelphia, PA: Elsevier Saunders; 2013:854-856.