[Hypercalcemia and primary hyperparathyroidism. Epidemiologic and diagnostic aspects]

Area of Science:

• Endocrinology and Metabolism
• Clinical Diagnostics

Context:

• Assessing the prevalence of hypercalcemia in a general patient population.
• Evaluating the diagnostic yield of primary hyperparathyroidism in hypercalcemic individuals.

Purpose:

• To determine the incidence of hypercalcemia and primary hyperparathyroidism in an unselected patient cohort.
• To assess the reliability of parathyroid hormone (PTH) measurement using different radioimmunoassay (RIA) systems.

Summary:

• A study of Viennese in- and out-patients found a 1.1% incidence of hypercalcemia.
• Primary hyperparathyroidism was diagnosed in 20% of hypercalcemic patients, with 8% surgically confirmed, suggesting a lower limit incidence of 200 cases per 100,000 population.
• Significant variability in PTH determination efficiency was observed among four RIA systems, ranging from clinically useless to 90% effective.

Impact:

• Provides crucial epidemiological data on hypercalcemia and primary hyperparathyroidism prevalence.
• Highlights the critical need for standardized and validated PTH assays in clinical practice.
• Informs diagnostic strategies and resource allocation for endocrine disorders in the Viennese region.