Screen all patients > 24 weeks' gestation for fetal growth abnormalities using symphysis fundal height.Fundal height can be used to monitor fetal growth or to roughly estimate gestational age in an emergency.Measured from the top of the pubic symphysis to the top of the uterus.> 5 days gestational age discrepancy in gestations 7 days gestational age discrepancy in gestations 9–13 weeks. For a gestational age discrepancy between ultrasound and LMP, use EDD determined by ultrasound if:.Second-trimester US : estimation is based on fetal biometric parameters.First-trimester US : estimation is based on crown-rump length.Ultrasound: should be performed to estimate gestational age if LMP is unreliable.May be unreliable in patients with uncertain LMP or irregular menstrual cycles.Expected date of delivery (due date) is estimated as the first day of the LMP + 280 days.Methods of pregnancy dating include one or both of the following:. Guiding the timing of prenatal screening and fetal monitoring.Determination of gestational age and estimated date of delivery is important for:.Gestational age and estimated date of delivery In high-risk pregnancies or if there is concern for fetal well-being, consider:.Assess growth via physical examinations and ultrasound (US).Monitoring fetal growth and wellbeing General principles High-risk pregnancies generally warrant more than the usual number of follow-up visits for maternal and/or fetal surveillance.
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