parathyroid hormone (pth) intact
A parathyroid hormone (PTH) blood test measures the level of parathyroid hormone in the blood. This test is used to help identify hyperparathyroidism, to find the cause of abnormal calcium levels, or to check the status of chronic kidney disease.hy It Is Done. A test for parathyroid hormone (PTH) is done to: 1  Help identify hyperparathyroidism. 2  Find the cause of an abnormal blood calcium level. 3  Check to see whether a problem with the parathyroid glands is causing the abnormal calcium level.