Measurement of Oral Calcium Absorption from the Gut by External Isotope Counting

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Abstract
Among the factors which regulate normal gastro-intestinal calcium absorption, current thought recognises calcium intake, vitamin D and parathyroid hormone as playing an important part. It is well documented that gastro-intestinal calcium absorption is reduced in states of malabsorption, hypoparathyroidism and in patients with chronic renal failure, and raised in states of hyperparathyroidism, urolithiasis and idiopathic hypercalcuria. Difficulties inherent in classic calcium-balance techniques have prompted a search for more practical and reliable methods of measuring the degree of impairment of calcium absorption. This paper describes a study of intestinal calcium absorption in 10 normal subjects and four patients, with various disorders of calcium metabolism, using an external radio-isotope counting technique.

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