Using ultrasound, your provider can take various measurements (head circumference and diameter, abdomen circumference, and femur length ... for estimating how big a fetus should be, and honestly ...

±8% of the estimate CRL = crown rump length; FL = femur length; HC = head circumference. Reprinted with permission from Callen. [20] a These are indicators of conception age (menstrual age ...

One of the more frustrating situations occurs when there is a significant difference between a late second- or early third-trimester ultrasound ... crown rump length; FL = femur length; HC ...