How to Prepare for a CT Scan

This guide outlines how to prepare for your CT scan, including what to wear, eating and drinking instructions, and information about contrast dye. Following these steps helps ensure accurate images and a smooth appointment.

Check your referral

Your referral form or booking confirmation will specify whether your scan requires contrast. Preparation can differ depending on the type of CT ordered by your doctor.

General preparation

• Bring your referral, Medicare card, and any previous imaging if available.
• Arrive 10–15 minutes before your appointment to complete forms.
• Wear loose, comfortable clothing without metal zips, belts, or buttons.
• Leave jewellery, watches, and piercings at home when possible.
• Continue taking your usual medications unless instructed otherwise.

Fasting and hydration

• If your scan uses contrast, avoid eating for 2–4 hours before your appointment.
• Drink water to stay hydrated; clear fluids are usually fine.
• If your scan does not use contrast, you can generally eat and drink normally.

Patients with diabetes or kidney conditions

• Tell us if you have diabetes or kidney problems. These conditions can affect how your body handles contrast dye.
• If you take metformin, you may need to pause it temporarily after your scan. We will give specific instructions.
• Bring a list of current medications with you.

Contrast injection preparation

• For contrast scans, a small IV cannula will be placed in your arm.
• Let staff know if you have had any reaction to iodine contrast before.
• Inform us of asthma, allergies, thyroid disease, or if you are pregnant or breastfeeding.

Pregnancy and children

• If you are or might be pregnant, inform us before your scan. We will assess whether CT is necessary or suggest an alternative such as ultrasound or MRI.
• For children, we tailor scanning protocols to keep radiation dose as low as possible.

On the day of your scan

1. Arrive a few minutes early to complete your questionnaire.
2. Remove metal items and change into a gown if required.
3. If contrast is used, you will have a brief consultation before the injection.
4. Relax and follow the radiographer’s instructions during the scan.

After your scan

• If you had contrast, drink extra water through the day to help flush it from your body.
• You can eat, drink, and resume normal activities immediately unless told otherwise.
• If you notice redness, swelling, or pain at the injection site, contact us or your GP.

Quick checklist

• Referral and Medicare card ready
• Loose, metal-free clothing
• Follow fasting instructions if contrast is used
• Drink water before and after
• Arrive early to allow time for paperwork

In summary

Most CT scans require little preparation. Following these simple steps helps ensure clear images and a safe, efficient experience. If you are unsure about fasting, medications, or contrast, contact our team before your appointment.