If your calcium level is normal and your level of parathyroid hormone (PTH) is high, it’s likely due to early presentation of hyperparathyroidism. Random blood levels may demonstrate high calcium occasionally. Some patients will eventually develop the full disease and its complications. Many never go on to develop the classic form of the disease. Although surgery in the case of normal calcium with high PTH normalizes the PTH levels much is unknown of its benefit in the long run.
For additional information, please refer to www.endocrine diseases.org: