Abstract

The twenty-four hour urinary excretion of calcium and sodium was measured in 38 normal volunteers after a week on a diet containing 400 mg of calcium per day. There was a significant correlation (P less than 0.001) between calcium and sodium excretion. The normal range of calcium excretion as a function of sodium excretion has been determined. This approach sharpens the definition of hypercalciuria by taking into account the influence of dietary sodium intake. It also removes the necessity of regulating dietary sodium as well as calcium intake before measuring calcium excretion in patients who form recurrent renal stones.

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