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Mineral Composition of Meconium

Effect of Prematurity

Division of Perinatal Medicine, Department of Pediatrics, North Shore University Hospital—New York University School of Medicine, Manhasset, New York

Address reprint requests to: Raul A. Wapnir, PhD, FACN, Department of Pediatrics, North Shore University Hospital, Manhasset, NY 11030

Objectives: We hypothesized that the concentration of major essential mineral elements in meconium correlate with gestational age (GA) or birth weight. To verify this premise we determined the concentration in meconium of calcium, magnesium, phosphorus, copper, zinc, iron, and manganese.

Methods: Thirty-four appropriate for age singleton infants without major congenital anomalies were divided into four GA groups (in weeks): 24 to 28; 29 to 33; 34 to 37; 38 to 42, or in birth weight groups (in g): <1500; 1500–1999; 2000–2499; 2500. Meconium was collected until the appearance of transitional stools and lyophilized for analysis.

Results: When adjusted for birth weight, the concentrations of calcium, copper, iron and phosphorus were higher in the meconium of 24 to 28 week GA infants than in those of the 38 to 42 week GA newborns. Birth weight adjusted copper concentration was highest in the 29 to 33 week GA group, while the remaining elements did not change across the range of GA. Meconium copper concentration in infants born with <2000 g was higher than in those born with a weight 2500 g.

Conclusions: These results could serve as normative data of a noninvasive examination of the mineral nutritional "history" of the fetus, and, eventually, to better evaluate possible neonatal deficiencies in infants with intrauterine growth retardation or other types of complicated intrauterine courses.

Key words: meconium, minerals, prematurity, birth weight

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