Ontogeny of fetal liver glucose-6-phosphatase activity

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Abstract
A reliable and sensitive microassay for the measurement of liver glucose‐6‐phosphatase is described. Human fetal liver was assayed for glucose‐6‐phosphatase activity from 7.5 to 24 weeks of gestation and was found to have a mean activity of 2.11 nmol per min per mg of protein. This was approximately 30 per cent of the postnatal controls assayed by the same method, but there was no evidence of a change in activity during the gestational period examined. If fetal liver tissue can be reliably obtained, it may be possible to determine a deficiency of glucose‐6‐phosphatase in fetuses who are at risk.