Nasal Bone Length Clinical Trial
Official title:
Fetal Nasal Bone Length Nomogram at 11-13wk+6 Days in Upper Egyptain Pregnant Women
establish a reference values for the fetal nasal bone length (NBL) in upper egyptian pregnant women at 11-13wk+6 days
By using ultrasound measure fetal nasal bone length at 11-13wk+6days in Upper Egyptian pregnant women in mid-sagittal view in single pregnancy ;