الفهرس 
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Abstract
Summary
his limited study showed that fetal abdominal subcutaneous
tissue thickness can serve as a useful parameter for
estimating fetal weight.
The study included 120 pregnant women and conducted
in Ain Shams Maternity Hospital.
The mean fetal abdominal subcutaneous tissue thickness
(FAST) was 6.35 ± 2.02 mm (range: 3.5 – 14.8 mm).
Among all included women, there were no significant
correlation between fetal anterior abdominal wall fat
thickness and each of maternal age, parity and gestational
age. There was a significant positive correlation between
fetal anterior abdominal wall fat thickness and birth weight
[r=0.320, p<0.001].
There was a significant difference between women with
different birth weight categories (average, low and
macrosomia) regarding the mean value of FAST.
The best cutoff value of FAST above which
macrosomia is more likely was 7.3 mm [sensitivity 93%,
specificity 80.1%, positive predictive value (PPV) 21.21%
and negative predictive value (NPV) 93%.
T
Summary
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The best cutoff value of FAST below which low birth
weight is more likely was 4.2 mm [sensitivity 86.50%,
specificity 93.3%, PPV 41.2% and NPV 84.3%.
The AUC for the FAST as predictor of macrosomia was
larger than that for it as predictor of low birth weight,
indicating that FAST is a better predictor for macrosomia
than for low birth weight.
EFW by Hadlock’s Formula (BPD, FL, AC) had been
evaluated during our study as being one of commonly used
weight estimation formulas. At both birth weight extremities,
it had lower sensitivity but higher specificity when compared
to results obtained from FAST as a predictor of fetal weight.
Being a simple measure obtained through 2D ultrasound
in a standard plane gives it high applicability.
It could be combined with weight estimation formulas
as a method to increase its accuracy especially at birth weight
extremities