Calcium Suppression + Renal Phosphorus Threshold Tests In Diagnosis Of Hyperparathyroidism

Using a standard infusion of 500 mg of calcium gluconate, and collecting urine in four hourly fractions for 36 hours in patients whose calcium and phosphorus intake had been previously stabilised for 3 days a satisfactory difference in the degree of inhibition of phosphate excretion between cuparathyroidism, and hypo- and hyperparathyroidism was achieved. The value of the renal phosphorus threshold estimation is diminished by the finding of threshold figures between 2.0 and 3.0 mg/100 ml in both hyperparathyroidism and normal subjects.