Immunoglobulin A (IgA) - Serum

Immunoglobulin A (IgA) is a key antibody that defends your digestive system and respiratory tract from invading pathogens. This essential blood test measures the levels of IgA circulating in your serum, helping doctors evaluate how well your immune system is protecting these critical areas. High or low IgA levels can signal underlying immune system issues, frequently seen with problems like chronic diarrhea, recurrent sinus infections, asthma, allergies, or certain autoimmune disorders such as lupus and celiac disease. Testing your IgA levels provides important information used to diagnose and monitor conditions associated with abnormal immune responses. Understanding these levels is a vital step toward managing your overall health.