Parathyroid hormone (PTH) is important in controlling blood calcium levels. When calcium levels are low, the parathyroid gland releases PTH into the bloodstream. PTH is able to retrieve calcium from bone, stimulate vitamin D activation in the kidneys and suppress calcium excretion in the urine.
What might a low result mean?
A low PTH may be due to conditions causing high calcium levels in the blood - hypercalcaemia, or hypoparathyroidism, an abnormality in the production of PTH.
What might a high result mean?
High PTH levels can be caused by overactive parathyroid glands - hyperparathyroidism and kidney disease.