Final answer:
Intussusception in a child is diagnosed through imaging tests such as ultrasound or an abdominal X-ray. Treatment often involves air or barium enema to push the intestine back into place.
Step-by-step explanation:
Intussusception is a condition where one segment of the intestine slides inside the adjacent segment, causing a blockage and reducing blood flow to the affected area. It is mainly diagnosed through imaging tests such as ultrasound or an abdominal X-ray. When diagnosed, immediate treatment is necessary, and the most common approach is air or barium enema, which involves injecting air or contrast material into the rectum to push the intestine back into its normal position.