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  • Title: Alkaline phosphatase isoenzymes in the plasma of preterm and term infants: serial measurements and clinical correlations.
    Author: Crofton PM, Hume R.
    Journal: Clin Chem; 1987 Oct; 33(10):1783-7. PubMed ID: 3665030.
    Abstract:
    Serial measurements of the bone and fetal intestinal isoenzymes of alkaline phosphatase (EC 3.1.3.1) in the plasma of 43 term and 43 preterm infants, from birth to six weeks later, indicate that the bone isoenzyme gradually increases over this period in both preterm and term infants fed with unsupplemented commercial formulas. Preterm babies given formula supplemented with calcium (with or without additional phosphate) had significantly lower bone isoenzyme activities for most of the study period. The concentrations of fetal intestinal isoenzyme increased, under the stimulation of milk feeding, from generally undetectable at birth to a peak during the first two weeks postpartum, and then declined. This increase was highly significantly negatively correlated with gestational age, the preterm infants having a much higher and more prolonged increase in this isoenzyme than did term infants. Unlike the adult isoenzyme, fetal intestinal alkaline phosphatase in plasma showed no relationship with blood group status.
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