Why get tested?
To determine whether PTH levels are responding normally to changes in blood calcium levels; to distinguish the cause of calcium imbalances, and to evaluate parathyroid function. In some centres, PTH levels may be measured during surgery for hyperparathyroidectomy. This will confirm removal of the parathyroid gland(s).

When to get tested?
When calcium blood levels are higher or lower than normal, and when your doctor wants to determine how well your parathyroid gland is functioning.

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