Serum Magnesium Levels in the Newborn and Older Child

Abstract
Data on serum Mg++ levels in 56 newborns and 64 older children, using a rapid ultramicro method, is presented. No appreciable changes were found in the first week of life, though cord blood levels were somewhat higher than the subsequent sera levels. No differences were noted with breast as opposed to bottle feeding. The lack of any significant differences between venous and capillary blood allows the confident use of capillary samples for this determination in the newborn period.

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