Rawlings et al developed a nomogram for estimating blood volume in a neonate with polycythemia. The blood volume per kilogram body weight varies with the body weight. The authors are from Tripler Army Medical Center in Honolulu.
(blood volume in mL) / (body weight in kilograms) =
= (-0.012 * (birthweight in grams)) + 124
blood volume in mL =
= ((-0.012 * (birthweight in grams)) + 124) * (birthweight in grams) / 1000
This could be rewritten:
blood volume in mL =
= (-0.000012 * ((birthweight in kg)^2)) + (124 * (birthweight in kg))
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