Preparing for a CT Scan

Preparation for a CT scan depends on the type of exam and whether contrast will be used. Proper preparation supports accurate results and reduces the risk of complications.

Fasting and contrast

When an exam uses intravenous contrast, patients are usually asked to fast for about 2 to 4 hours beforehand, according to the facility's protocol. This lowers the risk of nausea or vomiting when contrast is given.

A non-contrast CT generally does not require fasting. Confirm this with staff to avoid confusion.

Information to share

Mention any allergies, especially to contrast or specific medications. Also tell staff if you have diabetes, kidney disease, or take metformin.

Inform the team of any possibility of pregnancy and of implants or medical devices in your body. Bring a list of current medications.

During and after the exam

During a contrast exam, you may feel warmth in the body or the urge to urinate. These sensations are usually temporary. Tell the staff right away if you feel short of breath or unwell.

After the exam, you can usually resume normal activities. Drinking enough water helps clear contrast from the body when contrast was used.

Key points

• Fasting for a few hours is often requested when contrast is used.
• Mention medications, allergies, and kidney conditions beforehand.

Educational information, not a substitute for medical advice.