en قلب Heart پژوهشي Research <p><strong>Back ground</strong></p> <p>Anemia in pregnancy is associated with increased rates of maternal and perinatal mortality, premature delivery, low birth weight, and other adverse outcomes</p> <p><strong>Materials and Methods</strong></p> <p>A prospective study was conducted on 1405 Iranian pregnant women who delivered during 2015. Blood was collected from all the subjects to measure the hemoglobin (Hb) during 16-19 weeks, 22-24 weeks, and 34-36 weeks of gestation. According to the level of hemoglobin, it is divided into 4 groups. Group 1 Hb > 10.1 gm/100ml (control group), Group 2 Hb= 8.1-10 gm/100ml (mild anemia) Group 3 Hb= 6.5-8 gm/100ml (moderate anemia) Group 4 Hb <6.5 gm/100ml (severe anemia). After delivery, the neonates were weighted within 24 hours after birth. Maternal hemoglobin and birth weights were compared.</p> <p><strong>Results</strong></p> <p>The anemia prevalence was 20.2%</p> <p></p> <p>(Hb<10g/dl). Out of them, 16.2 % hadmoderate anemia (Hb=6.5-8 g/dl) and 83.8% had mild anemia (Hb=8.1-10 g/dl). Severe anemia did not detect in pregnant women. The hemoglobin levels in non anemic group showed a drop in the second trimester. Pregnant women with hemoglobin less than 10 g/dl, considered as anemic gave birth to neonates with birth weight of 2.6kg, while pregnant women with higher hemoglobin level (>10 g/dl), considered  as normal gave birth to heavier and normal babies (3.3 kg). The severity of anemia during three trimesters was closely associated with birth weight of newborns.</p> <p><strong>Conclusion</strong></p> <p>The low hemoglobin values during three trimesters of pregnancy were associated with low birth weight in Iran. The anemia can lead to intra uterine growth retardation.</p> Hemoglobin Level, Birth Weight, Pregnancy 211 217 http://ijpho.ssu.ac.ir/browse.php?a_code=A-10-70-62&slc_lang=en&sid=1 F Moghaddam Tabrizi Yes S Barjasteh No