The Levels of Serum Enzymes, Plasma Proteins and Lipids in Normal Infants and Small Children

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Abstract
A group of 291 children aged 3 wk to 6 1/2 yr was examined at a public maternal and child health center and 260 of them, who were considered to be healthy, were included in the present study. By venipuncture, serum was obtained for the analysis of 6 enzymes and plasma for the estimation of 9 proteins and for lipid analyses. In different age groups, high levels were found for alkaline phosphatase, lactate dehydrogenase, aspartate aminotransferase, alanine aminotransferase, creatine kinase and .gamma.-glutamyl transferase. Haptoglobin, .alpha.1-antitrypsin, prealbumin and transferrin were present at low concentrations during the 1st months of life. Transferrin rose later in childhood to above adult levels. Only IgM showed a sex difference, with higher values for girls. Breast-fed infants had higher (non-fasting) concentrations of cholesterol and triglycerides than formula-fed babies and they also had higher levels of aspartate aminotransferase and alanine aminotransferase.

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