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Journal of Clinical Endocrinology & Metabolism, Vol 68, 1123-1127, Copyright © 1989 by Endocrine Society

ARTICLES

Serum concentrations of alkaline phosphatase isoenzymes and osteocalcin in normal pregnancy

A Rodin, A Duncan, HW Quartero, G Pistofidis, G Mashiter, K Whitaker, D Crook, JC Stevenson, MG Chapman and I Fogelman
Department of Obstetrics, Guy's Hospital, London, England.

We measured serum alkaline phosphatase isoenzymes and osteocalcin levels in 40 healthy women at 4-week intervals throughout uncomplicated pregnancies and 6 weeks after delivery in 17 women. Serum bone alkaline phosphatase was significantly higher in the third trimester than in early pregnancy (P less than 0.001), and this elevation was still apparent at the end of the puerperium, suggesting increased bone turnover. Serum osteocalcin was not detected (less than 0.2 micrograms/L) after the first trimester in the majority of women, and it reappeared within 48 h after delivery. The disappearance of osteocalcin after the first trimester and its rapid reappearance after delivery suggest placental clearance of this peptide. We conclude that serum osteocalcin measurements cannot be used as a marker of bone metabolism during pregnancy.


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