Abdominal circumference correlates with fetal weight. Femur length has the advantage of accurately reflecting fetal growth patterns.
Limitations: Abdominal circumference can be difficult to measure accurately by ultrasound.
Hadlock (1984)
estimated fetal weight in grams =
=10^(1.3598 + (0.051 * (abdominal circumference in cm)) + (0.1844 * (femoral diaphysis length in cm)) - (0.0037 * (abdominal circumference in cm) * (femoral diaphysis length in cm)))
Hadlock (1985)
=10^(1.304 + (0.05281 * (abdominal circumference in cm)) + (0.1938 * (femoral diaphysis length in cm)) - (0.004 * (abdominal circumference in cm) * (femoral diaphysis length in cm)))
Woo (1985)
=10^(0.59 + (0.08 * (abdominal circumference in cm)) + (0.28 * (femoral diaphysis length in cm)) - (0.00716 * (abdominal circumference in cm) * (femoral diaphysis length in cm)))
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Specialty: Obstetrics & Gynecology, Pedatrics
