Mycoplasma pneumonia cannot be detected by routine blood test, which can only check the total number of white blood cells. Mycoplasma pneumonia can be detected by condensation set test and isolation culture of Mycoplasma pneumoniae, Mycoplasma antibody titer test, and antigen test of Mycoplasma pneumoniae. 1. Condensation set test: Condensation set test is important for diagnosing mycoplasma infection, especially mycoplasma pneumonia. After 2 weeks of disease onset, about two thirds of patients have a positive condensation set test with a titer of 1:32. If the titer increases gradually, it has more diagnostic value. 2. Antibody titer test: If serum Mycoplasma IgM antibody is ≥1:64, or if there is a 4-fold increase in antibody titer during the recovery period, the diagnosis can be further confirmed. 3. Mycoplasma pneumoniae isolation and culture: isolation of Mycoplasma pneumoniae from the patient’s nasopharynx, pharynx, body fluids or pleural fluid is a reliable criterion for the diagnosis of Mycoplasma infection. 4. Antigen detection of Mycoplasma pneumoniae: Mycoplasma pneumoniae antigen can be detected directly from respiratory specimens, which can be used for early and rapid clinical diagnosis. The results of routine blood tests alone cannot accurately determine whether it is Mycoplasma pneumonia, but also need to be combined with the characteristics of the medical history, other test results of a comprehensive judgment, it is recommended to clarify the cause of the disease under the guidance of a doctor.