Fasting before the whole abdomen ct examination, you can drink a small amount of water, will not affect the examination and the examination results. Whole abdomen ct mainly examines organs including stomach, duodenum, liver, spleen, gallbladder, pancreas, kidneys, small intestine, colon, appendix and so on. Fasting, i.e., fasting for 5 to 8 hours, is usually required to complete a whole abdomen ct. Food residues may remain in the stomach, intestines, etc., causing artifacts and affecting observation. Food may stimulate bile secretion, and eating will affect the observation effect on the gallbladder. A small amount of drinking water will not have any effect on the residue left in the stomach, intestines, etc., and will not form artifacts that will affect the observation. Drinking water will also not cause the secretion of bile, which will affect the observation effect. Before doing the whole abdomen ct examination, you need to empty stomach, small amount of drinking water has no effect on the result, it is recommended to regulate the treatment under the guidance of the doctor.