By creating an AVF the artery and vein become big enough to insert a needle needed for haemodialysis but also allows more blood to be passed through. An ultrasound scan of your AVF is sometimes called a duplex or Doppler. Duplex is entirely safe and is used to detect problems with your AVF that may prevent successful haemodialysis. The test is painless and does not use any radiation or needles.

What will Happen?

  • You may eat and drink as usual prior to the test and you do not need to remove your hearing aid or glasses.
  • You will most likely be asked to sit on the edge of the bed or in a chair.
  • Although most clothes can be kept on, we will need to have access to your shoulder, arm and hand.
  • A water-based gel, which may feel cold, and a probe will be placed onto your skin.
  • Images will appear on the screen of your blood vessels, similar to the picture above. You may hear some noises from the machine but this is perfectly routine.
  • A clinical vascular scientist (who might be male or female) will perform and interpret your ultrasound scan.