Mycoplasma IgG greater than 300 is positive and represents a previous mycoplasma infection, but it is too single-minded to measure the severity of the disease. First of all, Mycoplasma is the smallest prokaryotic microorganism. Secondly, IgG is an immunoglobulin G antibody, the presence of which indicates that the patient has been infected with the pathogen. Therefore, Mycoplasma IgG positivity is not a single indicator that can be used to evaluate the health of the body. And mycoplasma IgG positive is a broader concept, there are many types of mycoplasma including Mycoplasma pneumoniae, Mycoplasma genitalium, Mycoplasma hominis, Mycoplasma fermentans, Mycoplasma spermatophilum, Mycoplasma penetrans, and so on, and each type of mycoplasma can induce different diseases. A comprehensive physical examination of the relevant sites is recommended for further evaluation. Usually no treatment is required if there are no associated clinical symptoms, but the presence of a positive IgM for Mycoplasma often requires consideration of a recent Mycoplasma infection, which requires symptomatic treatment.