Contrast CT


A contrast medium (also known as dye) is sometimes required during a CT scan. It contains iodine and is injected intravenously into the blood, enhancing the visibility of blood vessels, structures and organs.

The risk of an allergic reaction to CT contrast is small. We use a non-ionic contrast agent which minimizes the relative risk of reactions and we prescreen all patients to ensure they are not at increased risk (e.g. renal insufficiency, diabetes or respiratory disease).


  1. Please submit recent (within the past 90 days) Creatinine results
  2. Please include relevant history and test results



  • Rules out fatal blood clots in the lung
  • Excludes high blood pressure caused by narrowing of the kidney arteries
  • Assesses for any obstruction or narrowing of the mesenteric (major arteries supplying the small and large intestines) and peripheral (arteries supplying the arm and legs) arteries
  • Excludes aneurysms of the abdominal aorta and other major mesenteric and peripheral arteries


  • Rules out fatal blood clots in the lung
  • Helps to differentiate epidural scar from recurrent disc herniation in patients who are post-op discectomy


  • Assesses aneurysms of the Circle of Willis


  • Staging of intrabdominal malignancies (e.g. colon cancer, renal cell cancer, gastric cancer, lymphoma)
  • Work-up of lesions noted on other modalities (e.g. ultrasound, non-contrast CT)
  • Surveillance of liver for hepatoma in patients who are hepatitis B and C positive
  • Assesses possible abscess from diverticular disease or irritable bowel disease


Reports are available to the referring physician within one working day of the scan. If the results are urgent, we will telephone the physician to discuss the findings.

Click here for information on your Contrast CT appointment.