Abstract
One hundred antenatal patients were studied at term pregnancy at Gauhati Medical College, Guwahati, andfetal birth weight estimation was done in utero Ultrasono-graphically. The parameters measured wereAbdominal Circumference (AC), Biparietal diameter (BPD) and Femur Length (FL), Fetal weightprediction was done with Shepards formula using AC and BPD as well as Hadlocks formula using FL andAC. The scan delivery interval was maintained at 72 hours or less. Results of both formulae were comparedwith the actual fetal birthweight taken within 15 minutes of delivery. With Shepards formula, the predictedfetal weight was within 100 gm of the actual fetal weight in 71% cases, within 150gm in 86% cases, within200 gms in 93% cases and within 250 gms in 98%. With Hadlocks formula, the predicted birthweight waswithin 100 gms of the actual fetal weight in 72% cases, within 150 gms in 83%, within 200 gms in 92%cases and within 300 gms in 98%. The mean percent error calculated as Error % = Predicted weight - actualweight divided by actual weight x 100 was 2.9% with Shepards formula and 3% with Hadlocks. These datathus support a significant correlation between ultrasonographic estimation and actual fetal birth weight.Key Words: Fetal birth weight, AC, BPD, FL
Highlights
The assesment of fetal birthweight forms an important part of prenatal care
The clinical management, the outcome of pregnancy, delivery and survival of the newborn are greatly influenced by the knowledge of fetal weight Accurate determination of fetal weight prior to delivery can have a significant bearing on management decisions in labour, thereby markedly improving perinatal outcome
The predicted fetal weight was within 100 gms of actual weight in 71% cases, within 150 gms in 86% cases, within 200 gms in 93% and 250 gms in 98% with Shepards formula
Summary
The assesment of fetal birthweight forms an important part of prenatal care. The clinical management, the outcome of pregnancy, delivery and survival of the newborn are greatly influenced by the knowledge of fetal weight Accurate determination of fetal weight prior to delivery can have a significant bearing on management decisions in labour, thereby markedly improving perinatal outcome. The route of delivery is influenced by the size of the baby. Knowledge of fetal by the most suitable route. Fetuses weighting more than 3.5kg., if presenting by the podalic extremity will be better managed by delivery via the abdominal route. In a case of multifetal pregnancy with gross discordance in fetal sizes, where the much smaller twin presents as the first candidate for delivery, one may opt for a caesarian section
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