placental weight and its association with maternal and neonatal characteristics

placenta plays a vital role in normal fetal development and failure of placenta to gain weight and insufficiency of its function can result in fetal disorders. we performed this study to determine placental weight and factors associated with low weight placentas. in a longitudinal cross-sectional study, women with single pregnancy, and gestational age between 37-42 weeks were studied. the subjects were categorized in high (> 750 g), normal (330-750 g), and low placental weights ( th minutes after delivery were examined. one thousand-eighty eight pregnant women were included in the study. the mean and standard deviation for maternal ages and gestational ages at deliveries were 25.35 ± 5.6 and 247.51 ± 9.56 days, respectively. the mean and standard deviation of neonates' weights at birth and placental weights were 3214.28 ± 529 and 529.72 ± 113 g, respectively. the prevalences of low and high placental weights were 2% and 2.8%, respectively. there were statistically significant relationships between placental weight and birth weight, fetal distress, apgar score, maternal diabetes, pre-eclampsia and approaches of deliveries (α = 0.05). our findings indicate that placental weight can be associated with important variables influencing some maternal and neonatal outcomes and placental weight lower than 330 g can be a warning sign. careful attention to placenta growth during pregnancy, for example by ultrasonography, can guide physicians to assess neonatal health.