Contrast Injection Facts

Why is a Contrast Agent Used?

Computer Tomography (CT) scans may require contrast dye to be injected intravenously. This dye will assist in the visualisation of blood vessels and organs within the body. The contrast dye will enhance your scan and allow our radiologist to give a more comprehensive diagnosis.

Contrast injections are considered to be safe, however there may be a small risk associated with the injection of contrast media. The team will assess this risk at the time of your examination. Normally within 3-5 hours of the initial injection, the contrast is excreted out of the body.

Please inform the Radiographer or Radiologist if you have any prior medical conditions. This will help us plan your scan accordingly.

Please inform us immediately if you have:

  • A concern about the contrast agent
  • If you are on dialysis
  • Had a moderate or severe allergic reaction to contrast in the past
  • Severe heart disease
  • Unstable asthma that currently needs treatment
  • Any allergies to food or medication
  • Multiple myeloma, sickle cell disease, or polycythemia
  • Severe kidney disease, especially if it is caused by diabetes