Home › Categories › Immunology › Immunoglobulin A

Immunoglobulin A

IgA Serum IgA
Serum (SST) g/L

About this test

Predominant immunoglobulin in mucosal secretions. Deficiency (most common primary immunodeficiency) is associated with coeliac disease and anaphylaxis to IgA-containing blood products.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 0.8 – 4.5 Adult

Clinical Interpretation

Low / Decreased
IgA deficiency (<0.07 g/L) — selective IgA deficiency (most common), coeliac disease association. Total IgA must be checked before interpreting anti-tTG IgA.
High / Increased
Elevated — IgA myeloma, IgA nephropathy, liver disease, chronic infections.

Related Tests

Anti-tTG IgA
Specimen
Serum (SST)
Reporting Unit
g/L
Category
🛡️ Immunology

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.