Nutritional Guidelines: Going Without Food and Hydration Ahead of Your Scan
Guidelines on eating and drinking often cause the most confusion. Fasting before a CT scan is common, but the goal is to get the best images, not just to have an empty stomach. For scans of your belly or pelvis, not eating for 2-4 hours helps calm your digestive system. This reduces blurry movement and gives a clearer view of organs like your liver and kidneys. You can usually drink clear fluids like water, black tea, or black coffee right up to the scan. In fact, staying hydrated is a good idea. But if your scan uses a contrast dye, the instructions become more specific. Avoid milk, fizzy drinks, and chewing gum during the fast. Always stick to the exact guidance you were given, as it’s designed for your specific test. If you have diabetes, your care team will give you special advice to manage your blood sugar during the fast. This short period without food is a small effort for a much clearer result.