The length of the femur can be predicted from the biparietal diameter in a normally developing fetus.
expected femur length in mm =
= (0.9028 * (biparietal diameter in mm)) - 9.3105
ratio of observed to predicted femur length =
= (length observed) / length predicted)
• Good ultrasonographic images with accurate measurement using electronic calipers are required.
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Specialty: Obstetrics & Gynecology, Pedatrics