Tehran University of Medical Sciences Journal of Family and Reproductive Health 1735-8949 9 3 2015 10 06 125 128 Lyly Nazemi Maternal, Fetal and Neonatal Research Center AND School of Nutritional Sciences and Dietetic, Department of Clinical Nutrition, Tehran University of Medical Sciences, Tehran, Iran Mamak Shariat Maternal, Fetal and Neonatal Research Center, Tehran University of Medical Sciences, Tehran, Iran Maryam Chamari School of Nutritional Sciences and Dietetic, Department of Clinical Nutrition, Tehran University of Medical Sciences, Tehran, Iran Reza Chahardoli Department of Cellular and Molecular, School of Nutritional Sciences and Dietetic, Tehran University of Medical Sciences, Tehran, Iran Leila Asgarzadeh Breastfeeding Research Center, Tehran University of Medical Sciences, Tehran-Iran Fariba Seighali Maternal, Fetal and Neonatal Research Center AND School of Nutritional Sciences and Dietetic, Department of Clinical Nutrition, Tehran University of Medical Sciences, Tehran, Iran AND Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine AND Fetal and Neonatal Research Center, Tehran University of Medical Sciences Tehran, Iran 2015 10 06 2015 10 06 Objective:To compare the maternal and umbilical cord serum selenium concentrations in Low and normal birth weight neonates. Materials and methods:A case-control study was carried out in Vali-Asr and Akbarabadi Hospitals (Jan. to Dec. 2013). Two groups; case group; 91 mothers who delivered a low birth weight (LBW) neonate and control group; 86 subjects who delivered a normal birth weight neonate were selected. Immediately after birth, 5 ml of maternal blood and umbilical cord blood were collected, and sent to laboratory to assay Se concentrations. To compare both groups' blood Se concentration, data were analyzed in SPSS 16.0. Results:Eighty six (48.6%) mothers with normal birth weight neonates and 91 (51.4%) mothers with low birth weight infants entered the study. Mean maternal mothers' age and mean maternal blood Se were 28.55+5.90 years and 79.3756+26.46915. A significant association was seen between maternal blood and cord blood Se level in control and case group (P value<0.0001, r = 0.69) and (P value<0.001, r = 0.79). On the other hand no differences were seen between 2 groups' maternal blood Se level (P Value = 0.65). Umbilical Cord blood Se concentration was not also different between case and control group (P value = 0.46). Conclusion:We found that maternal and umbilical cord blood Se concentrations were not different in low and adequate birth weight infants, however; umbilical cord Se concentrations were positively correlated with maternal blood Se concentrations. https://jfrh.tums.ac.ir/index.php/jfrh/article/view/162 https://jfrh.tums.ac.ir/index.php/jfrh/article/download/162/162