Why get tested?
To determine whether PTH levels are responding normally to changes in blood calcium levels; to distinguish the cause of calcium imbalances; to evaluate parathyroid function; during surgery for hyperparathyroidism, to confirm removal of the gland(s) causing the problem

When to get tested?
When calcium blood levels are higher or lower than normal, when you are having surgery for hyperparathyroidism, or when your doctor wants to determine how well your parathyroid glands are functioning

Sample required?
A blood sample drawn from a vein in your arm