Examinations generally refer to physical examinations, which are performed with various instruments. There are many specific items, such as the common ECG, ultrasound, chest X-ray, CT, standing abdominal plain film, pathological examination and so on. There are also non-invasive and invasive tests. Non-invasive tests are generally non-invasive and do not cause any discomfort to the patient, such as ECG, ultrasound, CT, chest X-ray, etc. They are all non-invasive tests. For invasive tests, such as bronchoscopy, percutaneous lung puncture, gastroscopy, etc., these are invasive tests and have certain risks. It may cause some discomfort to the patient, so it is necessary to measure whether the patient can perform the above mentioned tests before the examination. Generally, blood tests, electrocardiograms and other tests are required, as well as tests for infectious diseases, and only if the patient meets these conditions can the above tests be performed.