Tip 73: antenatal umbilical artery Doppler

In normal pregnancy, there is a progressive increase in end-diastolic velocity due to growth and dilatation of the umbilical circulation. The resistance index therefore falls.

A resistance index >0.72 is outside the normal limits from 26/40 onwards.

In some pregnancies with IUGR and/or pre-eclampsia, there is a reduction in the diastolic velocity and in severe cases there is absent or reversed end diastolic velocity.


Reference: McCowan, L., 2001. Doppler Studies in High Risk Pregnancies. Guideline from Auckland and District Health Board: Neonatal Intensive Care.

First published: 25/03/14

This entry was posted in Antenatal, Prematurity. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s