The four tests for pneumonia mainly include Mycoplasma pneumoniae IgG and IgM antibodies, and Chlamydia pneumoniae IgG and IgM antibodies for a total of four tests that can determine the status of infection by these two pathogens. The tests will be more meaningful in the case of upper respiratory tract infections with fever and cold, acute bronchitis with cough and sputum, and pneumonia. If these tests are not done, it is likely that the infection will be considered bacterial and viral, without considering that it is an infection of these two pathogens, and thus the medication will not be so targeted, and it is likely that the symptoms will not improve after a long time of medication, so these two tests are necessary and sometimes very effective.