My father-in-law only checked the gastroscope for about half a month, and now he is going to a big hospital for re-examination. Can he do gastroscopy again after half a month? Please ask a professional doctor to answer thank you. At present, there is no uniform standard for the interval of gastroscopy in China. If the condition is not particularly serious, it is recommended to do it at least once every six months. Gastroscope is harmless to the body, but the patient is very painful when doing gastroscope. I suggest you consult a doctor directly when you go for a reexamination. I hope my answer is helpful to you. Thank you.