Background and Objectives: Preeclampsia is one of the most threatening problems in pregnancy and potentially is followed by preterm birth, miscarriage, low birth weight and maternal mortality.
Folic acid supplementation is commonly prescribed for women in child bearing age to reduce the prevalence of neural tube defects. However, its role in pre-eclampsia and hypertension is not proven and is debatable. The aim of this study was to evaluate the influence of folic acid on before pregnancy care on blood pressure in pregnancy.

Material and Methods: This retrospective cohort study was conducted as census on all 1939 women referred to receive prenatal care between 2008 and 2013 in rural and urban healthcare centers in Sarab, Bostanabad and Khosroshahr. We compared blood pressure changes in two groups with folic acid consumption and another group, not consuming folic acid. Collected data were filled in the checklist and underwent statistical analysis of descriptive and analytical methods by SPSS 16.

Results: The mean age of women in this study was 25.98±5.78 years. Ninety-two percent of mothers had regular consumption of folic acid during pregnancy. The peak period of high blood pressure was reported at weeks 37-35 with 8.2% in systolic blood pressure and diastolic blood pressure at week 37-35 and more than 37 weeks with 1.6%. Systolic and diastolic pressure in mothers taking folic acid was significantly lower (P <0.05). Paternal occupation and the correct pattern of folic acid consumption during pregnancy were the most important predictive factors for hypertension in pregnancy. (P <0.05)

Conclusion: Folic acid intake during pregnancy, as a part of prenatal care, significantly reduces the incidence of hypertension of pregnancy. During this period, folic acid intake can diminish pre-eclampsia and promote maternal and new born health.