Overview:

The serum Immunoglobulin A (IgA) level test measures the amount of IgA antibodies present in the blood. IgA is an antibody found in mucosal areas such as the respiratory and gastrointestinal tracts. It plays a critical role in immune defense, especially in the mucosal immunity, protecting against infections.

Risk Assessment:

• Low IgA levels may indicate:
  • IgA deficiency (common primary immune deficiency).
  • Chronic infections.
  • Celiac disease (when associated with gastrointestinal symptoms).
  • Autoimmune disorders like rheumatoid arthritis or systemic lupus erythematosus.
  • Chronic kidney disease or nephrotic syndrome.
• High IgA levels may indicate:
  • Chronic infections (e.g., hepatitis).
  • Liver disease.
  • Multiple myeloma or monoclonal gammopathies.
  • Inflammatory diseases (e.g., inflammatory bowel disease).
  • Celiac disease (often increased IgA in mucosal tissues).

Normal Range:

The normal reference range for IgA can vary slightly between laboratories, but generally:

• Adult males: 70-400 mg/dL
• Adult females: 70-400 mg/dL (Note: Values may differ slightly based on the method used and laboratory standards.)

Interpretation:

• Low IgA levels (IgA deficiency) may predispose individuals to recurrent infections, especially upper respiratory infections, gastrointestinal disturbances, and may be associated with autoimmune conditions.

• High IgA levels could indicate ongoing chronic inflammatory conditions or an underlying malignancy. It is important to correlate the result with clinical symptoms and further diagnostic testing.

Sample Type:

• The test requires a serum sample, typically obtained via venipuncture (blood drawn from a vein).