Normal fetal biometry - second trimester


These selected images from a second trimester morphology ultrasound demonstrate appropriate measurement of fetal biometry.  Note that the final gestational age (GA) calculation resulted in a 6 day discrepancy with the menstrual dates. This however is within the acceptable margin of error, variably taken as +/- 7 or 10 days.  The fetal size is therefore apropriate for dates, and the menstrual EDD should not be adjusted .