Best parameter measured by ultrasound to assess foetal maturity?
A. Crown rump lengthB. Biparietal diameter
C. Ratio of transverse diameter of abdomen to foetal head diameter
D. Transverse diameter of abdomen
The Answer is. C.
(Ratio of transverse diameter of
abdomen to foetal head diameter)
The most sensitive indicator of
symmetric and asymmetric IUGR is the abdominal circumference, which has a
sensitivity of over 95 percent if the measurement is below the 2.5th
percentile. Head: abdomen ratio is very useful in suspected IUGR when sparing
head growth is observed (asymmetrical IUGR) and ratio is increased. Between 20
and 36 weeks of gestation, the HC/AC ratio normally drops almost linearly from 1.2 to 1.0. The
ratio is normal in the fetus with symmetric growth restriction and elevated in
the infant with asymmetric growth restriction.
