In the context of the classification of hypercalciuria in urolithiasis, the measurement of enteral calcium absorption is very important. A precise method is that of oral load with 47Ca and measurement of its activity by means of a human body counter; 47Ca activity in serum, urine and stools in simultaneously measured. To date 47 patients with chronically recidive calcium lithiasis (with between 3 and over 100 stone episodes) and an average age of 43.2 years have been examined. Calcium absorption lay between 42.7% and 90.0% of the dose, the average was 59.3% with a standard deviation of +/- 12.9. This is higher than in persons with healthy kidneys, but not significantly so. Calcium absorption is significantly lower in patients with renal insufficiency. The studies on calcium kinetics revealed turnover rates and pool sizes within the normal range.
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