Parathyroid Hormone, or PTH, is tested to determine the cause of calcium imbalance, or evaluate the parathyroid glands function.
A blood sample is required from your arm vein.
The average PTH value is between 10 – 65 pg/ml.
Low levels of PTH may be due to conditions causing hypercalcemia or to an abnormality in PTH production causing hypoparathyroidism.
Elevated levels of PTH may be due to hyperparathyroidism, which is most frequently caused by a benign parathyroid tumor. In rare cases, it may be caused by cancer.
Doctors usually order both blood calcium test and PTH together for evaluation.
Keywords: low PTH, high PTH, elevated PTH, decreased PTH