الفهرس 
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Abstract
The aim of this prospective longitudinal study was to investigate
the relationship between placental thickness during the second and third
trimesters and placental and birth weights.
This study included 100 pregnant women who underwent routine
ultrasound examination in the second and third trimesters during which
placental thickness and estimated fetal weight were recorded using
Hadlock formula, and were followed up for their pregnancy outcome and
birth weight.
The mean age of cases was 28±5 years and the mean of BMI was
27.82±3.2 and the mean parity was 1.47±1.2.
Ultrasonography measures of the means of placental thickness in
the first visit and second visit and third visit were 24.91±1.27,
29.50±1.23, 34.60±1.6 mm respectively.
EFW by Had lock formula show that The mean EFW was
700.40±120.5 gm in first visit and in second visit was 1372.30±306 gm.
and in third visit was 2516.40±311gm.
When we measured EFW by regression formula using PT the
results were the mean EFW 701.26±90.5 gm in first visit and in second
visit was 1363.40±220 gm, and in third visit was 2518.12±192gm. There
was no significance difference between EFW using either Hadlock or regression formula. So we can use our regression formula instead of
Hadlock formula in measuring EFW by ultrasound.
There was a significant positive correlation between placental
thickness and birth weight in the second and third trimesters. There were
two group of neonates the first group whose neonatal birth weight more
than 2500 gm and there were 90 neonates. The other group was 10
neonates whose weight is less than 2500 gm.
Previous studies agreed with the current study in the correlation
between placental thickness and fetal weight (Abu et al, 2009)