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A Change of Serum Folate and Vitamin $B_{12}$ Concentrations of Maternal and Umbilical Cord Blood during Pregnancy  

Lee, Geum-Ju (Department of Food & Nutrition, Sungshin Women's University)
Jang, Hey-Mi (Department of Food & Nutrition, Sungshin Women's University)
Ahn, Hong-Seok (Department of Food & Nutrition, Sungshin Women's University)
Publication Information
Korean Journal of Community Nutrition / v.10, no.5, 2005 , pp. 615-622 More about this Journal
Abstract
Folate and Vitamin $B_{12}$ are essential nutrients important during pregnancy. This study was conducted to evaluate the folate and vitamin $B_{12}$ nutritional status of Korean pregnant women and to investigate the relationship between maternal­umbilical cord serum folate and vitamin B12 levels and pregnancy outcomes. Dietary intakes of the pregnant women were estimated by 24 hour-recall (3 times). Serum folate and vitamin B12 levels in maternal blood and umbilical cord of 27 pregnant women at 1'st-, 2'nd-, 3'rd-trimester and delivery were measured by RIA (radioimmuno assay), respectively. Means of folate and vitamin $B_{12}$ intake were $283.53\pm58.01{\mu}g/day\;and\; 2.99\pm1.32mg/day$, respectively. Maternal mean serum folate levels of the trimester and delivery were $9.75\pm3.60ng/ml,\;10.46\pm4.63ng/ml,\;10.71\pm4.14ng/ml\;and\;15.05\pm7.04ng/ml$. Those maternal levels were significantly lower than that of umbilical cord blood $(23.99\pm9.42ng/ml)$. Serum vitamin $B_{12}$ levels of maternal trimester and delivery were $479.07\pm137.56 pg/ml,\;310.96\pm137.56pg/ml,\;308.22\pm74.65pg/ml,\;and\;295.67\pm93.36pg/ml$, which were significantly lower than those of umbilical cord blood $(500.13\pm185.60ng/ml)$. This finding indicates that the uptake of folate and vitamin $B_{12}$ in the fetus may be due to an active placental transport mechanism. Maternal serum level correlated positively with those of umbilical cord blood, showing that folate and vitamin $B_{12}$ concentration of umbilical cord blood might be affected by maternal status. There was no significant correlation between the serum folate levels in maternal-umbilical cord blood and the pregnancy outcomes. However, maternal vitamin $B_{12}$ level at l'st trimester was significant positive correlation between the gestational age except for birth weight and weight gain.
Keywords
pregnant women; serum folate; serum vitamin; pregnancy outcome;
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