1. VITAMIN D DEFICIENCY IN PREGNANCY AND ITS RELATIONSHIP WITH MATERNAL-FETAL OUTCOMES IN WOMEN LIVING IN THE TROPICS INTRODUCTION Vitamin D deficiency in pregnancy has been reported as variable as 5 to 50% and its association with pregnancy-related outcomes is still controversial. Measurement of maternal serum 25OHD at the end of pregnancy is closely related to cord blood levels. 40% had skin phototype between I-III, 65% had a cesarean section as a method of delivery and 72% at term. Gestational diabetes, hypertension and pre-eclampsia occurred in 16.4%, 31.5% and 20.6%, respectively. Mean serum 25OHD was 27.5 ±7.5ng/ml, 67% had levels 5. Women with 25OHD ≥30ng/ml (in comparison with those with <20ng/ml) had significant higher serum albumin concentrations (3.4 ±0.4 vs 3.2 ±0.4g/dl; p=0.03); lower total hemoglobin (11.23 ±1.2 vs 12.1 ±1.6g/dl; p=0.005); lower BMI at the end of pregnancy (29.3 ±5.5 vs 32.3±5.7Kg/m 2 ; p=0.03); CONCLUSION We found a high prevalence of vitamin D deficiency in late pregnancy in women living in a tropical area, which was unrelated to sun index and skin pigmentation. Vitamin D sufficiency was associated with better nutritional status and hemodynamic adaptation during pregnancy and to less neonate adiposity. We found no association between vitamin D deficiency and pre-term birth, gestation diabetes or pre-eclampsia. REFERENCES METHODS Maternal-fetal clinical and laboratory parameters were analyzed in 165 consecutive pregnant women (mean age 27,30 ±6,32yr). Blood samples were collected at the end of pregnancy and vitamin D deficiency was defined according to two cut points for serum 25OHD concentrations (<20 and <30 ng/ml). Cynthia Salgado, Juliana Maia, Manoel Soares Filho, Paula Aragão, Luiz Griz, Cristiane Farias, Francisco Bandeira Division of Endocrinology, Diabetes and Obstetrics, Agamenon Magalhães Hospital, University of Pernambuco Medical School, Recife, Brazil www.ued-ham.org.br MON-248 RESULTS OBJECTIVE The aim of this study was to evaluate de prevalence of vitamin D deficiency during pregnancy and its relationship with maternal-fetal outcomes. and their neonate had lower arm circumference (9.5 ±1.9 vs 10.3 ±1.1cm; p=0.03). There were no differences in mean sun index between the 2 groups (3.2 ±4.1 vs 3.5 ±4.3; p=0.3). More patients with skin phototypes between I-III had 25OHD <20ng/ml (21% vs 14% in those between IV-VI) but without statistical significance (p=0.8). There was no difference using cut point of 25OHD <30ng/ml between patients with skin phototypes I–III and IV-VI (66.2% vs 68%, p= 0.8). There was also no significant difference in the rate of pre-term birth, gestational diabetes and pre-eclampsia between the two groups. 1-Poel YH, Hummel P, Lips P, Stam F, van der Ploeg T. Vitamin D and gestational diabetes: a systematic review and meta-analysis. Eur J Intern Med. 2012. Jul;23(5):465-9. 2-Møller UK, Streym S, Heickendorff L. Effects of 25OHD concentrations on chances of pregnancy and pregnancy outcomes: a cohort study in healthy Danish women. Eur J Clin Nutr. 2012. Jul;66(7):862-8 3-Clifton-Bligh RJ, McElduff P, McElduff A. Maternal vitamin D deficiency, ethnicity and gestational diabetes. Diabet Med. 2008 Jun;25(6):678-84