First, the doctor will do the necessary physical examination, and the abdominal examination includes visual inspection, auscultation, percussion, and palpation. In addition, skin bleeding points, ecchymoses, jaundice, cardiopulmonary examination, groin, and anal finger examination should be observed. Secondly, choose some necessary laboratory tests, blood, urine, fecal routine, serum and urine amylase, Helicobacter pylori serum antibody and 13 carbon breath test; for suspected peritonitis, internal bleeding, abdominal abscess and certain abdominal masses Diagnostic puncture and routine smear, bacterial culture or pathological examination of the puncture.

       Some patients also need to do some imaging studies to confirm the diagnosis. X-ray examination: chest and abdomen fluoroscopy, routine filming, air enema and barium enema examination can be selected as needed. In addition, B-ultrasound, endoscopy, CT, magnetic resonance and radionuclide scanning have good diagnostic value, and should be selected according to the condition. For children with suspected myocarditis or cardiomyopathy, an electrocardiogram should be performed.

       Finally, parents should be reminded that the day of the visit is to let the children go to the hospital on an empty stomach, because many examinations must be fasted.