Ultrasonography for fetal weight estimation: the Birnholz equation.
In the population of 563 normal live births, subject to the selection criteria of this study, the mean ultrasonographically-estimated fetal weight calculated using the Birnholz equation accurately predicts the mean true birth weight with less than 1 percent error. However, on a pairwise basis, the error was found to be systematic (rather than random) with a large standard error of the estimate (+/- 300 g). The equation consistently underestimated the mean birth weight between 1500-3750 g and consistently overestimated it thereafter.
Acker
D B
DB
Department of Obstetrics and Gynecology, Beth Israel Hospital, Boston, MA 02215.
Sachs
B P
BP
Ransil
B J
BJ
Friedman
E A
EA
D001724:Birth Weight; D001835:Body Weight; D005333:Fetus / Q000033:anatomy & histology*; D006801:Humans; D007231:Infant, Newborn; D008433:Mathematics; D014463:Ultrasonography