Determination of Gestational Age by Ultrasound

Objective: To assist clinicians in assigning gestational age based on ultrasound biometry . Outcomes: To determine whether ultrasound dating provides more accurate gestational age assessment than menstrual dating with or without the use of ultrasound . To provide maternity health care providers and researchers with evidence-based guidelines for the assignment of gestational age . To determine which ultrasound biometric parameters are superior when gestational age is uncertain . To determine whether ultrasound gestational age assessment is cost effective .