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This should include at least two fetal measurements (usually biparietal diameter (BPD) and femur length (FL)) plus a consideration of additional parameters such as head circumference (HC), occipitofrontal diameter (OFD), abdominal circumference (AC) and humerus length (HL).

Measurements in the beam axis are more accurate than those made across the axis. Crown-Rump Length (CRL) and femur length) should be measured across the axis.

Occasionally the view is not clear and it may be necessary to perform a vaginal scan.

You do not need to have a full bladder, a moderately filled bladder is needed for a proper examination.

Biparietal diameter (BPD) is one of the basic biometric parameters used to assess fetal size.

Topics are richly illustrated with more than 40,000 clinical photos, videos, diagrams, and radiographic images.

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.

The reduced accuracy of prediction of gestational age after 20 weeks must be appreciated.

The wide normal range of BPD in late pregnancy must be appreciated.

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