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Recent evidence suggests that the protein osteocalcin is like the bone alkaline phosphatase produced by osteoblasts and circulates in human blood. With the introduction of a radioimmunoassay for serum osteocalcin it was hoped that this test would provide a useful index of altered bone metabolism. Therefore serum osteocalcin was measured in 88 controls and 112 patients with disorders of calcium and phosphate metabolism, isolated elevation of alkaline serum phosphatase in the absence of disease (isolated hyperphosphatasaemia) and children prone to osteopenia. In the controls serum osteocalcin was higher in children < 15years (median and range: 11.9, 7.7-15.3 ng/ml) than in adults (3.7, 2.6-5.2 ng/ml) and was highly correlated to alkaline serum phosphatase activity (r = 0.87, n = 88, P< 0.01). Osteocalcin was elevated in primary hypoparathyroidism, low in untreated hypoparathyroidism but normal in hypoparathyroidism (including pseudohypoparathyroidism) during vitamin D treatment. The bone protein was low-normal and increased to high-normal levels during vitamin D therapy in vitamin D deficiency rickets and familial hypophosphataemic rickets, but remained low in patients with end organ

Author

K. Kruse; U. Kracht

Publisher

Springer; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0340-6997)

Published

1986

Language

EN