Accuracy of Trans-Cerebellar Diameter and Placental Thickness in Third Trimesteric Pregnant Women for Calculation of Gestational Age: A Cross Sectional Study

Background: Accurate determination of gestational age has become important for deciding the appropriate time termination pregnancy as well to monitor fetal growth during entire period pregnancy. Objective: The aim study was assess whether trans-cerebellar diameter, placental thickness or combining both them is more accurate assessment in 3rd trimester Patients and Methods: This a cross sectional conducted at outpatient Clinic Obstetric ward, Ain Shams University Maternity Hospital, over six months from March 2019 September 2019. One hundred pregnant women were recruited according inclusion criteria either clinic admitted obstetric ward Hospital find out most biometric measurement third diameter compared reliable LMP (last menstrual period) dates confirmed by crown rump length (CRL) first trimester. Results: Trans-cerebellar mean ± SD 46.0 3.5 with range 38.2 - 51.7. 39.6 7.1 22.8 54.3. Placental had highest (0.813) last followed (0.802). Combining increased (0.902) period. Conclusion: Combined use indicator whose unreliable unknown, but higher accuracy than diameter.