It is always necessary to consult a doctor before the CT scan, because due to the radiation exposure, the CT scan can only be performed on the basis of a medical recommendation.
Native CT examination does not require special preparation. Contrast agent is very rarely given to the patient during a CT scan of the paranasal sinuses, however, it is recommended that you do not eat food for 6 hours before the scan.
Anyone who comes for a scan with contrast agent is not allowed to eat for six hours before the examination!
Prior to a CT scan with contrast agent, metformin medications for diabetes should be discontinued for 48 hours prior to the examination and resumed 48 hours afterwards.