We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
A new formula for calculating weight in the fetus of ≤ 1600 g.
- Authors
Schild, R. L.; Fell, K.; Fimmers, R.; Gembruch, U.; Hansmann, M.
- Abstract
Objective To develop and test a new formula for estimating weight in the fetus of ≤1600 g. Methods A formula for sonographic estimation of fetal weight was produced retrospectively from 84 singleton fetuses with a birth weight of ≤1600 g, examined sonographically within 1 week before delivery. Exclusion criteria were multiple pregnancy, intrauterine death and major structural or chromosomal anomalies. The new formula was then compared prospectively in an evaluation group of fetuses (n = 87) with six currently available equations for estimating weight in the preterm fetus. Results Stepwise regression analysis with gestational age (in days) and fetal biometric parameters was employed to yield the best-fit formula for predicting fetal weight at birth. The new formula (estimated fetal weight = 5381.193 + 150.324 × head circumference + 2.069 × femur length³ + 0.0232 × abdominal circumference³ -6235.478 × log(head circumference)) proved to be superior to established equations. The lowest mean ± SD absolute error was 66.2 ± 59 g and the lowest mean absolute percentage error was 7.1 ± 5.9% SD when studied prospectively in the evaluation group. With the new formula, 48.3% of estimates fell within ±5% of the actual weight at birth, 73.6% fell within ±10%, 90.8% fell within ±15% and 95.4% fell within ±20%. Conclusion Our new formula is relatively easy to use and needs no adjustment to weight centiles or to fetal lie. It allows reliable weight estimation in the fetus ≤1600 g.
- Subjects
FETAL development; ULTRASONIC imaging; BIRTH weight; MULTIPLE pregnancy; FETAL death; GESTATIONAL age
- Publication
Ultrasound in Obstetrics & Gynecology, 2004, Vol 24, Issue 7, p775
- ISSN
0960-7692
- Publication type
Article
- DOI
10.1002/uog.1741