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Correlation between Human Placental Lactogen Levels and Glucose Metabolism in Pregnant Women with Intrauterine Growth Retardation

Summary: Twenty pregnant women with fetal growth retardation and 20 pregnant women with appropriate for gestational age fetuses (controls) were recruited after the 28th week of gestation. Samples were collected for estimation of serum insulin and human placental lactogen (HPL) levels in the fasting state and a glucose tolerance test was carried out on all the subjects. The results showed the glucose and HPL levels to be significantly lower in the fetal growth retardation group compared to controls. There were no differences in the fasting serum insulin levels in the 2 groups. Fetal growth retardation appears to be linked with the absence of development of the physiological ‘diabetogenic’ state in the second half of pregnancy. This maternal hypoglycaemic state is associated with low HPL levels and not with raised maternal insulin levels as measured in the fasting state.