JOEL F. HABENER, M.D.; GINO V. SEGRE, M.D.
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The study by Raisz and colleagues reported in this issue (1), although based on a small number of samples, illustrates both the assets and limitations of commercially available radioimmunoassays for immunoreactive parathyroid hormone (iPTH). When the same samples from 15 patients with surgically proven hyperparathyroidism were analyzed, good agreement was found among three of the four participating laboratories. A positive correlation between serum calcium and iPTH was seen in two of the four laboratories and is reported to be present in a third when more samples are analyzed (2). The values obtained for plasma iPTH in 14 hypercalcemic patients with
HABENER JF, SEGRE GV. Parathyroid Hormone Radioimmunoassay. Ann Intern Med. ;91:782–785. doi: 10.7326/0003-4819-91-5-782
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Published: Ann Intern Med. 1979;91(5):782-785.
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