2364: Estimation of placental thickness in second and third trimester and its correlation to the gestational age in Pakistani population

Abstract

Objectives: (1) To determine the thickness of placenta during second and third trimester. (2) To correlate relationship between placental thickness and gestational age determined by BPD, FL and AC. (3) To establish a normogram for the placental thickness which can aid in early detection of placental abnormalities and fetal abnormalities related with placental thickness.Methods: (1) All 1000 cases included in this study were normal cases for antenatal routine scanning. (2) The cases found to be of high risk including IUGR, hypertension, diabetes mellitus, fetal anomalies and multiple pregnancy were not included. Placental thickness was measured near the mid portion or center of the placenta. The equipments used included Medison-8000 live and Toshiba nemio-20 with curvilinear probes.Results: Out of 1000 singleton pregnancies, 90% patients had placental thickness ±5 mm (1SD) corresponded with the gestational age whereas all 1000 corresponded with the mean placental thickness ±10 mm (2SD). It is observed in this study that placental thickness gradually increase from start of second trimester to the 37th week. From 21st to 35th week, the placental thickness almost matches the gestational age in weeks thereafter it lowers by 1 to 2 mm.Conclusions: Placental thickness measurements are helpful in cases where exact gestational age is not known and it can help to evaluate placental abnormalities if it is not corresponding with gestational age. Objectives: (1) To determine the thickness of placenta during second and third trimester. (2) To correlate relationship between placental thickness and gestational age determined by BPD, FL and AC. (3) To establish a normogram for the placental thickness which can aid in early detection of placental abnormalities and fetal abnormalities related with placental thickness. Methods: (1) All 1000 cases included in this study were normal cases for antenatal routine scanning. (2) The cases found to be of high risk including IUGR, hypertension, diabetes mellitus, fetal anomalies and multiple pregnancy were not included. Placental thickness was measured near the mid portion or center of the placenta. The equipments used included Medison-8000 live and Toshiba nemio-20 with curvilinear probes. Results: Out of 1000 singleton pregnancies, 90% patients had placental thickness ±5 mm (1SD) corresponded with the gestational age whereas all 1000 corresponded with the mean placental thickness ±10 mm (2SD). It is observed in this study that placental thickness gradually increase from start of second trimester to the 37th week. From 21st to 35th week, the placental thickness almost matches the gestational age in weeks thereafter it lowers by 1 to 2 mm. Conclusions: Placental thickness measurements are helpful in cases where exact gestational age is not known and it can help to evaluate placental abnormalities if it is not corresponding with gestational age.