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The IgA (immunoglobulin A) test is a blood test that measures the level of immunoglobulin A, an antibody essential for immune defense, especially in protecting the mucous membranes of the respiratory, digestive, and urinary tracts. Abnormal IgA levels may indicate immune system disorders, infections, inflammatory bowel diseases, or celiac disease. This test is used to diagnose immune deficiencies, autoimmune diseases, and to monitor certain infections and inflammatory conditions.
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