Abstract
In clinical practice, physicians often encounter patients with persistent elevated
serum parathyroid hormone levels and normal serum calcium levels, a state known as
normocalcemic hyperparathyroidism (NHPT). The investigation of NHPT cases can lead
to unnecessary use of parathyroid scintigraphy (PS) and consequently unnecessary health-care
costs. In this clinical review, the most common causes of NHPT and the possible indications
for PS performance in such cases are mainly presented and discussed.
Keywords
Normocalcemic hyperparathyroidism - parathyroid hormone - parathyroid scintigraphy
- primary hyperparathyroidism - secondary hyperparathyroidism - Vitamin D