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Serum copper (Cu) and zinc (Zn) concentrations were measured in neonates with an appropriate birth weight for gestational age (AGA) and in small-for-gestational age infants. At 7 days of age, there was a positive correlation between serum Cu concentration and gestational age (GA) (r = 0.63; P &lt; 0.001) and a negative correlation between Zn concentration and GA (r = 0.62; P &lt; 0.01). At 7 days of age, the mean (+/- S.E.) concentrations in AGA full-term infants (Cu, 79 +/- 8 microgram/dl; Zn, 84 +/- 4) were similar to those in small-for-gestational age, full-term infants (Cu, 78 +/- 6 microgram/dl; Zn, 85 +/- 12). In preterm infants, there was also no difference between AGA and small-for-gestational age infants. In 23 AGA infants with a birth weight of less than 1500 g, serum Cu concentration increased from 51 +/- 7 microgram/dl at the age of 7 days to 86 +/- 7 microgram/dl at the age of 60 days (paired t-test: P &lt; 0.05) whereas serum Zn concentration decreased from 149 +/- 9 to 91 +/- 5 microgram/dl (P &lt; 0.01). A positive correlation was found between serum Zn concentration and daily intake of Zn (n = 39; r = 0.3458; P &lt; 0.05), but no correlation was found for serum Cu concentration. The evolution of serum Cu and Zn concentration with total age (GA + postnatal age) in the infants with a low birth weight (i.e., &lt; 1500 g) was similar to the evolution with GA.

Serum Copper and Zinc Concentration in Premature and Small-For-Date Infants