Trans-cerebellar Diameter and Placental Thickness in Third Trimesteric Pregnant Women for Calculation of Gestational Age

Accuracy of Trans-cerebellar Diameter and Placental Thickness in Third Trimesteric Pregnant Women for Calculation of Gestational Age: Prospective Study

Pregnant women at 32-36 weeks gestational age with sure gestational dating (based in both last menstrual period and dating ultrasound) and otherwise normal singleton pregnancy will be recruited. Ultrasonographic estimation of gestational age using combined transcerebellar diameter and placental thickness will be compared to the actual estimated gestational age.

Inclusion Criteria:

• Sure of dates
• Have dating ultrasound with crown rump length between (9 to 12 )weeks
• No hormonal contraception 3 months before conception.
• Regular menstrual cycles.
• Medically free.
• Single pregnancy
• Gestational age 32-36 weeks

Exclusion Criteria:

• Irregular menstrual cycles and not sure of dates
• Multiple pregnancy.
• Fetal anomalies.
• Placenta previa, placental anomalies and poor visualization of the placenta
• Fetal growth restriction
• Pregnant women with medical disorder e.g. diabetes mellitus, Pre-eclampsia, Systemic lupus erythromatosis, hypertension.