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Which one of the following regarding antenatal assessment of umbilical aeries by Color Doppler studyis TRUE?

A
There is decreased S/D ratio in smoker and nicotine abusing pregnant females
B
The reduced diastolic flow at term indicates good prognosis
C
The flow velocities and the S/D ratio are useful to evaluate high risk pregnancies
D
In otherwise normal pregnancies the increased S/D ratio is normal in smoking females
High-Yield Explanation
C i.e. The flow velocities & S/D ratio are useful to evaluate high risk pregnancies Colour doppler analysis of umbilical aeries play an impoant role in assessment of high risk fetus (pregnancy)Q.
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