Caffeine can cloud image, researchers report

Researchers at St. Louis University School of Medicine found that caffeine just before a CT scan or positron emission tomography (PET) imaging can obscure scan results.

Is it OK to drink coffee 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 should you not do before a CT scan?

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.