Is serum parathormone assay necessary in evaluating primary hyperparathyroidism?

Area of Science:

• Endocrinology
• Surgical Pathology

Background:

• Serum parathormone (PTH) is crucial for diagnosing hyperparathyroidism and pre-operative assessment.
• Persistent hypercalcemia with normal renal function often indicates primary hyperparathyroidism.

Purpose of the Study:

• To evaluate the diagnostic utility of preoperative serum PTH levels in patients undergoing cervical exploration for presumed primary hyperparathyroidism.
• To assess the impact of PTH levels on the incidence of negative cervical explorations.

Main Methods:

• Retrospective analysis of 328 adult patients with hypercalcemia undergoing cervical exploration from 1975-1983.
• Preoperative serum PTH values were analyzed in 137 patients.

Main Results:

• Eight negative explorations (5.8%) occurred; three had normal PTH, five had elevated PTH.
• Serum PTH was normal or low in 31 of 129 patients (24% false-negative rate).
• Preoperative PTH did not decrease negative explorations and was misleading in 25% of cases.

Conclusions:

• Preoperative serum PTH levels are not consistently reliable for diagnosing hyperparathyroidism.
• The diagnostic accuracy of PTH testing in this context is limited, potentially leading to unnecessary surgeries or delayed diagnosis.