Blood 5-hydroxytryptamine levels in the newborn.

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Abstract
Whole blood 5-hydroxytryptamine (5HT) levels, determined in a series of normal full-term infants, were low at birth (21 [plus or minus] 13 m[mu]g/ml) but rose to adult concentrations (162 [plus or minus] 64 m[mu]g/ml) by 4-6 weeks of life, though blood platelet counts remained unchanged. These findings are likely to be connected with the maturation of enzymes responsible for 5-hydroxytryptamine synthesis.