how to prepare for a CT scan

The instructions will be described clearly in your appointment letter.
All medication can be taken as normal.
All diabetic patients are asked to contact the centre prior to the scan.
For examinations of the abdomen and pelvis you will be asked to drink up to a litre of fluid in the hour prior to the scan. This helps to identify the stomach and bowel on the CT images.
For CT scans of the pelvis you may need to have a full bladder.
For examinations of the chest, abdomen and pelvis you may be asked to undress and put on a dressing gown prior to the scan. This will not be necessary if you wear clothes that have no metallic buttons, zips, fasteners etc.
For examinations of the head you will be asked to remove earrings, hairclips and glasses.
For scans involving intravenous contrast injections you will be asked not to eat for 2 hours prior to the scan.
Patients undergoing virtual colonoscopy (also known as CT pneumocolon or CT colonography) have a more complicated preparation. This involves following a special diet for 2 days prior to the procedure and taking a laxative.