IgG Subclasses, Serum analysis is a laboratory test used to determine the levels of the four different types of IgG antibodies in the blood: IgG1, IgG2, IgG3, and IgG4. IgG antibodies are a key component of the immune system, playing a vital role in protecting the body from infections and diseases. This test helps assess immune function, especially in cases of primary or secondary immunodeficiency. It may be requested for patients who experience recurrent infections or who show symptoms indicating immune disorders. The results of the test are important for guiding treatment and appropriate interventions, such as the administration of antibodies or immunotherapy. Overall, IgG Subclasses analysis provides valuable information about the health and effectiveness of the immune system.