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Clinical Chemistry 26: 588-591, 1980;
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Clinical Chemistry, Vol 26, 588-591, Copyright © 1980 by American Association for Clinical Chemistry

Amniotic fluid alkaline phosphatase, gamma-glutamyltransferase, and 5'- nucleotidase activity from 13 to 40 weeks' gestation, and alkaline phosphatase as an index of fetal lung maturity

D Brocklehurst and CE Wilde

Reference ranges for amniotic fluid alkaline phosphatase, gamma- glutamyltransferase, and 5-nucleotidase are described from 13 to 40 weeks' gestation. Gamma-glutamyltransferase and 5-nucleotidase activities peak early in the second trimester and then decrease to low values. Alkaline phosphatase shows a similar pattern of activity from 13 to 29 weeks' gestation, but thereafter activity increases to term; this late increase is mainly related to the heat-labile particulate form of alkaline phosphatase. Total and heat-labile alkaline phosphatase alone or expressed as a ratio with gamma- glutamyltransferase can be used with or as an alternative to lecithin/sphingomyelin ratios in the investigation of fetal lung maturity. A total alkaline phosphatase activity of 0.36 mukat/L and an alkaline phosphatase/gamma-glutamyltransferase ratio greater than 2 indicate pulmonary maturity.




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Copyright © 1980 by the American Association for Clinical Chemistry.