(1) Thoracic X-ray: shows significant subsidence of the lower sternum and adjacent rib cartilage, and shortening of the spine and sternal spacing. In severe cases, the end of the sternum meets the vertebrae of the spine. The heart is left shifted and the lung texture is thickened. Very few children often have chronic inflammation of the lungs and pulmonary atelectasis. (2) CT scan: The degree of depression, symmetry, cardiac compression and displacement, pulmonary compression and other combined problems of funnel chest can be more accurately evaluated with CT scan. CT scans can help to make more objective judgments when performing surgical procedures, such as combined pulmonary cystic adenomatoid malformation, isolated lung, lobar emphysema, and right thoracic aorta. (3) Electrocardiogram: Sinus arrhythmias, bidirectional or inverted P waves, incomplete right bundle branch block, cardiac stress transposition, and electrical axis deviation are most commonly seen. (4) Cardiac and pulmonary function tests: in severe cases, cardiopulmonary function is decreased. (5) Blood biochemistry: some patients have mild anemia and elevated serum alkaline phosphatase. Patients who have done the relevant tests but cannot confirm whether treatment is needed can send the test results online and I can reply to you online at my convenience.