The normal value of the Mycoplasma pneumoniae test is 1:40. The passive agglutination method is a method of diagnosing Mycoplasma pneumoniae infection, which is sensitive and easy, fast and inexpensive, and is suitable for routine clinical testing and screening. The antibody titer of Mycoplasma pneumoniae infection test >1:80 indicates that there is an infection, but it does not indicate that it is an acute infection. If the patient is acutely infected, it can only be judged by the clinical symptoms of the patient, and if it is positive, it does not mean that it is an acute infection.