Scott et al reported an equation for estimating the fetal weight of a fetus weighing less than 1,000 grams. The authors are from King George V Hospital in Sydney, Australia.

Patient selection: small fetus (premature, intrauterine growth retardation) estimated to weigh less than 1,000 grams


Ultrasound exam: within 7 days of delivery.



(1) head circumference in cm (HC)

(2) abdominal circumference in cm (AC)

(3) femur length in cm (FL)


X =

= (0.66 * LN(HC)) + (1.04 * LN(AC)) + (0.985 * LN(FL))


body weight in grams =

= EXP(X)

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