The influence of calcium intake and the status of intestinal calcium absorption on the diagnostic utility of measurements of 24-hour cyclic adenosine 3',5'-monophosphate excretion.


Twenty-five normal subjects, 45 patients with idiopathic hypercalciuria, and 50 patients with primary hyperparathyroidism were studied with an oral calcium tolerance test and with measurements of 24-h calcium and total cAMP excretion on defined 400-mg and 1000-mg calcium diets. There was a strong positive correlation (r = 0.62; P less than 0.001) between… (More)


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