RESUMEN
Objectives: To measure the cord blood and maternal serum levels of folic acid, vitamin B12, zinc, copper, selenium and lead in infants born with neural tube defect (NTD), and to examine a possible relationship between the nutriture of these micronutrients and occurrence of neural tube defect. Design: Case-control study. Methods: Maternal serum and cord blood samples were obtained at delivery from 70 healthy mothers and 74 mothers who had a newborn with NTD. Results: The mean (± SD) maternal serum zinc level in the NTD group was significantly lower than that of the control group (835.6 µg/L ±333.8 µg/L vs. 1035.7 µg/L ± 299.8 µg/L, P=0.004, respectively). The mean maternal and cord serum copper levels in the NTD group were significantly higher when compared to the control group (2831.1 µg/L ± 1017 µg/L vs. 2402 µg/L ± 744.2 µg/L; P=0.03; and 789.8 µg/L vs 517.2 µg/L, P<0.001, respectively). There was a negative correlation between the cord levels of folic acid and copper in the NTD group with the respective maternal serum levels (r=-0.289; P=0.018). Conclusions: High maternal serum levels of copper and lower level of zinc during pregnancy associated with NTD in newborn.