The premise for the approach of McCallum (1979) is that fetal body volume should correlate with fetal body weight.
estimated fetal weight in grams =
= e ^ (2.19 + (0.29 * (trunk circumference in cm)) - (0.004 * ((trunk circumference in cm)^2)) + (0.021 * (dorsal arc length in cm)))
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Specialty: Obstetrics & Gynecology, Pedatrics