Optimal Result:
69 - 446 mg/dL.
The Total Immunoglobulin A (IgA) biomarker, included in the 1018 Celiac Profile - Serum by Genova Diagnostics, plays a critical role in accurately assessing celiac disease and gluten-related disorders. Total IgA is essential for evaluating immune system function and ensuring the reliability of celiac-specific antibody tests.
What Is Total IgA?
Immunoglobulin A (IgA) is an antibody produced by the immune system to protect mucosal surfaces, such as the gastrointestinal and respiratory tracts. It serves as a first line of defense against infections and dietary antigens, like gluten.
Why Is Total IgA Important for Celiac Testing?
The 1018 Celiac Profile measures antibodies like anti-tissue transglutaminase (tTG) and deamidated gliadin peptide (DGP), which are critical markers for detecting celiac disease. However, if a person has IgA deficiency (a common immune condition), these tests can yield false-negative results. Measuring Total IgA ensures:
- The immune system is producing sufficient IgA for accurate testing.
- Any deficiency is identified, prompting additional testing with IgG-based markers to avoid misdiagnosis.
Key Facts About IgA Deficiency
- IgA deficiency is one of the most common primary immunodeficiencies, affecting 1 in 500 individuals.
- People with IgA deficiency are at higher risk for autoimmune conditions like celiac disease.
- When Total IgA levels are low, IgG-based testing is used to confirm or rule out gluten-related disorders.
How Total IgA Supports the Celiac Profile
By including Total IgA in the panel, the Genova Diagnostics test ensures:
- Test Accuracy: Proper interpretation of other celiac-specific biomarkers.
- Reliable Results: Reduced risk of false negatives in individuals with IgA deficiency.
- Comprehensive Screening: A holistic evaluation of immune response to gluten.
What Do Abnormal Total IgA Levels Mean?
- Low Total IgA: May indicate IgA deficiency, requiring IgG-based antibody testing to assess for celiac disease.
- Normal Total IgA: Confirms the reliability of IgA-dependent tests, like tTG IgA and DGP IgA.
Why This Matters
Celiac disease is often underdiagnosed, partly due to inaccurate testing in individuals with low IgA levels. Measuring Total IgA as part of the 1018 Celiac Profile ensures a thorough and accurate evaluation, enabling proper diagnosis and treatment.
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