IgA (immunoglobulin A)
IgA is an antibody that protects the mucosa (airways, digestive tract). Serum (total) IgA is part of the assessment of humoral immunity and key to the correct interpretation of the celiac disease test.
| Rating | Range | What it means |
|---|---|---|
| Worth improving | below 0.7 g/L | Low/absent IgA — important for interpreting the celiac test; if you have symptoms, seek advice. |
| Good | 0.7 – 4 g/L | IgA within range. |
| Worth improving | 4 g/L and above | Elevated IgA — possible chronic infections/liver disease. |
Why it matters
Low total IgA affects the celiac disease test (false negative).
If it’s low
Low/absent IgA (IgA deficiency) is often without problems, but it increases the risk for certain infections and requires a different (IgG-based) celiac disease test.
If it’s high
Elevated IgA can accompany chronic infections, liver or autoimmune diseases; on its own it is not a diagnosis.
What to do
If it is low AND you are doing a celiac disease test, discuss this information with a doctor (an IgG-based test is needed). Otherwise evaluate with symptoms and the other immunoglobulins.
When to see a doctor
Recurrent infections with low IgA → consultation.
Read together with
tTG-IgA (celiac disease) · IgG (immunoglobulin G)
This content is for information only and is not a substitute for medical advice. Talk to your doctor about your results.
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