Role of Doppler Examination at 36-42 Weeks of Pregnancy

Doppler ultrasound examination can be performed as a part of a more detailed ultrasound assessment that includes fetal biometry and anatomical survey, or as a separate ultrasound examination. Flow of the umbilical and fetal arteries is most often quantified either by pulsatility index or resistant index. These indices reflect the down stream vascular resistance by quantifying the differences between the peak systolic and the end‐diastolic velocity within blood vessels of interest in each cardiac cycle.