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Embryo measurements dating

The reduced accuracy of prediction of gestational age after 20 weeks must be appreciated.At any gestation, if the ultrasound fetal measurements of each parameter are not in agreement, the reason for this difference should be evaluated.If measurements taken after the first trimester are within one week of the gestational assessment taken from menstrual dating then the ultrasound assessment of gestational age confirms the menstrual dates.If the ultrasound measurements are in agreement and differ from menstrual dates by more than one week prior to 20 weeks a new estimated due date should be calculated and recorded.

Conditions which alter fetal growth will make the estimates less reliable.The BPD and OFD are measured on a transverse axial section of the fetal head which includes the falx cerebri anteriorly and posteriorly, the cavum septum pellucidum anteriorly in the midline and the thalami.The BPD is measured from the outer edge of the nearer parietal bone to the inner edge of the more distant parietal bone. The long bones are measured with the bone across the beam axis.Percentile Example: Out of 100 babies, a reading of forty percent (this is the percentile value) indicates that the baby is smaller than sixty other babies and larger than forty other babies. A value that reads below 50% indicates that the measurement is lower than the average.Thus, a value that is above 50% indicates that the measurement is above average.

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