Background:The placenta serves as the critical interface between the mother and the developing fetus. It plays a pivotal role in fetal growth by facilitating the transfer of oxygen and essential nutrients from maternal blood while simultaneously removing carbon dioxide and metabolic waste products during the intrauterine period. Hence; the present study was conducted for assessing the utility of sonographically thick placenta a marker for increased perinatal risk.Materials & methods:Two hundred pregnant women who were sure of dates from the antenatal clinic at 32 weeks were recruited. All patients were followed up to 36 weeks and after delivery. The placental thickness obtained by ultrasonography and correlated with foetal parameters such as femur length, bi-parietal diameter, head circumference and abdominal circumference were used to predict the estimated fetal birth weight as the primary outcome. The pregnant women with placental thickness and diameter between the 10th and 95th percentile was taken as having a normal placental thickness and were followed up as one group. Pregnant women with thickness below the 10th percentile and above 95th percentile was defined as having abnormally thin or thick placenta and were classified as a separate group and were followed up until delivery. All the results were recorded in Microsoft excel sheet and were subjected to statistical analysis using SPSS software. Results:Mean placental thickness was higher at 36 weeks, i.e., 3.25 ± 0.59, as compared to the placental thickness of 2.89 ± 0.45 at 32 weeks. Mean 10th and 95th percentile of placental thickness at 32 and 36 weeks are represented in table 5. The results revealed that the mean placental thickness at 32 weeks was 2.89, with 10th and 95th percentile being 2.2 and 3.5 respectively, and the mean placental thickness at 36 weeks was 3.25, with 10th and 95th percentile being 2.5 and 4.19 respectively. Pearson's correlation was applied to correlate the birth weight, age and gravida with placental thickness at 32 and 36 weeks. A positive, very weak, non-significant correlation was seen between birth weight and placental thickness at 32 weeks (r=0.072, p=0.314) and 36 weeks (r=0.005, p=0.94). Negative, very weak, non-significant correlation was seen between age and placental thickness at 32 weeks (r= -0.033, p=0.64) and 36 weeks (r= -0.053, p=0.45); between gravida and placental thickness at 32 weeks (r= -0.039, p=0.58) and 36 weeks (r= -0.033, p=0.64). Study subjects with thick placental thickness had more duration of NICU stay, i.e., 4 days at 32 weeks, as compared to subjects who had thin placenta, i.e., 3.33±0.577 and normal placental thickness, 2.38±0.87.Conclusion:There existed a significant relationship between placental thickness and foetal weight of women at gestational age of 32 and 36 weeks.Higher placental thickness for particular gestational age could results in low-birth-weight babies and poor fetal outcome.