Whether or not a 75 year old with atrophic gastritis needs to be sterilized for H. pylori is determined by a carbon 13 or carbon 14 breath test, which is required when the result is positive and the H. pylori exceeds a certain value. In the case of H. pylori positivity, a carbon 13 breath test value of more than 4 dpm or a carbon 14 breath test value of more than 100 dpm requires sterilization of H. pylori. In this case, timely elimination of H. pylori is necessary and can effectively improve atrophic gastritis. However, if H. pylori is not eliminated, atrophic gastritis is likely to worsen, and the possibility of metaplasia and carcinoma cannot be ruled out, which is very harmful to the human body and even fatal. If you are found to have atrophic gastritis, please consult a doctor in time, and follow the doctor’s instructions for medication.