This study is recommended only in the first half of the day (in the morning).
advance preparation:
stenosis of the exit from the stomach may require thorough training with a gastric lavage the day before (for advice for this reason you need to contact a gastroenterologist or radiologist).
it is necessary to take the existing Advisory opinion of experts on the disease, data of previous studies: abdominal ultrasound, gastroscopy and others (if any).