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Glucose tolerance and insulin secretion in patients with parathyroid disorders. Effect of serum calcium on insulin release.

To evaluate the role of serum calcium in human insulin secretion, insulin responses after a 100-g oral glucose load were studied in nine patients with primary hyperparathyroidism, five with idiopathic hypoparathyroidism, three with pseudohypoparathyroidism and one with normocalcemic secondary hyperparathyroidism. Glucose tolerance values in these disorders were almost normal. Insulin responses in primary hyperparathyroidism were increased, and those in idiopathic hypoparathyroidism and pseudohypoparathyroidism were reduced significantly as compared to normal subjects. Isulin response in secondary hyperparathyroidism was normal. The calculated insulin area during an oral glucose load was significantly correlated with serum calcium (5.1 to 12.2 mg per deciliter), and a linear relation was obtained (y = 1.59x - 3.3, r = 0.81, p less than 0.001), although a relation with the glucose area was not found. These observations indicate that serum calcium has an important effect on insulin secretion in parathyroid disorders.