Computed Tomography (CT scan)

Updated October 16, 2026

A CT scan, formerly known as a CAT scan, is a safe, generally painless exam. It uses X-rays that rotate around the body to create multiple pictures. Unlike a regular X-ray, CT scans can capture more detailed images of the inside of the body, including bones, organs and blood vessels.

1. Requesting medical imaging 

   Visit your health care provider for an assessment. If they recommend a CT scan, they will send a requisition form to a location that provides CT scans. 

   Please ensure your provider has your correct name, address, phone number and Personal Health Number (PHN) for your requisition form. 

2. Booking your appointment 

   Your health care provider will contact you with your appointment date, time and location. Appointments are scheduled based on the urgency and type of scan. 

   To change or cancel an appointment, please contact the location you are receiving the CT scan at, as soon as possible. 

3. Attending your test

   Preparation

   The amount of preparation depends on the type of CT scan. You will receive preparation instructions from your health care provider. Please review them before your appointment and follow all instructions to avoid any delays. 

   You may be asked to remove some of your clothes or change into a hospital gown. You may also be asked to remove jewellery, eyeglasses or other metal objects around the area of interest as they might interfere with the scan. 

   During the scan 

   You will be asked to lie on the scanner table. We will help you get into the desired position on your back, side or stomach. It is important not to move during the scan and follow any breathing instructions you are given. 

   A contrast agent, also known as x-ray dye, may be used depending on the type of scan. The dye is provided by intravenous (IV) injection, orally or by enema. When receiving the dye by IV injection, you may feel a warm, flush sensation, a metal-like taste in your mouth, or feel like you need to urinate. These sensations only last a few minutes. 

   The length of your exam depends on the type of CT scan. Plan on being in the CT department for up to 1 hour. Please note that emergency cases may be prioritized before your exam, which could result in delays. 

   Risks 

   Advances in CT technology help to keep radiation levels as low as possible. Please discuss any concerns with your health care provider. 

   If intravenous contrast is used as part of your scan, there is a small risk of an allergic reaction. Inform the technologist or radiologist if you have any allergies or if you have ever had a reaction to contrast material. 

   Bringing people with you 

   Companions that are essential to your physical and/or emotional support may be permitted to accompany you into the CT scan room. Inform reception, the technologist or radiologist if you wish to include an essential care partner. 

   Please ensure children 12 years of age and under have adult supervision at all times. They cannot accompany you into the exam room or be left alone in the waiting area. 

4. Accessing your health records 

   Your results are sent to the health care provider who ordered them. Contact your provider to review the results and talk about next steps. Some results may also be available in your Health Gateway. Learn about accessing your health records.