No food for 6-8 hours and no water for 4 hours before gastroscopy.
Doing gastroscopy needs fasting, normal gastric emptying time is usually in 4-6 hours, before doing gastroscopy need more than 6-8 hours can not eat, 4 hours can not drink water. If there is food residue in the stomach will affect the results of gastroscopy, can not clearly see the lesions in the stomach, for the diagnosis of the condition is unfavorable, but also easy to cause nausea, vomiting.
If you have used barium meal contrast before gastroscopy, then wait for the barium to be excreted completely before gastroscopy, and the fasting time may need to be a little longer, usually waiting for three days before checking the gastroscope.
In addition, two days before the gastroscopy should also pay attention to the diet, need to eat some fluids or easy to digest food, such as millet porridge, thin noodles, etc., avoid eating greasy and stimulating food, avoid eating meat food, avoid cold and relatively hard food.
Therefore, it is important to pay attention to gastric emptying before gastroscopy to avoid affecting the test results and adverse reactions.