Which immunoglobulin does the IGA Quant test measure?

The IGA Quant test specifically measures Immunoglobulin A. This immunoglobulin plays a crucial role in the immune function of mucous membranes and is found in high concentrations in secretions such as saliva, tears, and mucus, as well as in the gastrointestinal tract. It is important for defending against pathogens that enter through mucosal surfaces.

Understanding the specific function and location of Immunoglobulin A helps clarify why this test is focused on it. Other immunoglobulins, such as Immunoglobulin E, G, and M, serve different roles in the immune response but are not the target of the IGA Quant test. For example, Immunoglobulin E is primarily involved in allergic reactions, Immunoglobulin G is the most abundant type and plays a significant role in systemic immune responses, while Immunoglobulin M is the first antibody produced in response to infection.

Therefore, the IGA Quant test is designed to assess levels of Immunoglobulin A, making it essential for evaluating conditions related to mucosal immunity or certain immunodeficiencies.