How do I prepare for a CT scan?
Lily Fisher
Updated on May 18, 2026
How you prepare
- Take off some or all of your clothing and wear a hospital gown.
- Remove metal objects, such as a belt, jewelry, dentures and eyeglasses, which might interfere with image results.
- Refrain from eating or drinking for a few hours before your scan.
What should you not do before a CT scan?
Do not eat for 2.5 hours prior to the examination. You may have clear liquids up to two hours before the examination. Clear liquids include water, black coffee or tea, apple juice, clear soda, or clear broth. You may take your medication at your normal time with water.What preparation is required for a CT scan?
If your doctor ordered a CT scan with contrast, do not eat anything three hours prior to your CT scan. You are encouraged to drink clear liquids. You may also take your prescribed medications prior to your exam. DIABETICS: Diabetics should eat a light breakfast or lunch three hours prior to the scan time.How long does a CT scan take?
Typically, you should plan for an hour for a CT scan. Most of that time is for preparation. The scan itself takes between 10 and 30 minutes or less. Generally, you can resume your activities after a healthcare provider says it is safe to do so — usually after they complete the scan and verify clear images.What should I do the day before a CT scan?
Preparation for the Procedure
- You will be asked to follow the Limited Carbohydrate diet for the previous 24 hours before the date of your appointment.
- Do not eat or drink anything, except water, for 6 hours before the exam. ...
- Routine medications may be taken, unless you have been instructed otherwise.