The study focuses on differentiating primary hyperparathyroidism (PHPT) from secondary hyperparathyroidism due to idiopathic hypercalciuria (SHPT-IH) using the thiazide challenge test (TCT), highlighting the lack of robust diagnostic tools.
Conducted at Ghent University Hospital, the observational study monitored 25 adult patients exhibiting hypercalciuria and elevated parathyroid hormone levels who underwent the TCT.
Results indicated that PHPT patients demonstrated significantly higher increases in serum calcium than SHPT-IH patients, with the TCT achieving 81.8% sensitivity and 77.8% specificity, suggesting it is a helpful tool for clinical decision-making in distinguishing these conditions.