$12.00
Priced per marker, with baseline labs included. You’ll see your total before you pay.
Allergy & immunology
IgA test
Immunoglobulin A. Antibody class found in mucosal surfaces; low levels may suggest IgA deficiency which can affect celiac testing.
At a glance
In about 5 days
Most results are ready in about 5 days. Some specialty markers can take up to 21 days.
Check before your draw
This marker has no preparation tag, but it can still need preparation. Contact us before your draw if you’re not sure.
Walk in at Quest
Your lab order arrives by email. Most Quest locations take walk-ins, so bring it with a photo ID.
What it measures
IgA is an antibody that protects the moist linings of your body, like your gut, airways, and mouth. This can show how much of it your body makes.
Why it matters for women
Celiac disease is found more often in women, and the main celiac blood test relies on IgA. If your IgA is naturally low, that test can look normal even when celiac is present, so IgA may be checked alongside it. Low IgA can also come with more frequent infections.
You might check it if…
- you’re being tested for celiac disease
- you get frequent sinus, chest, or stomach infections
- a celiac test came back normal but symptoms continue
What your result may mean
High IgA: what it may mean
High IgA may point to a long-lasting infection, liver disease or an autoimmune condition, such as rheumatoid arthritis, lupus, celiac disease or IgA nephropathy, a kidney condition. In rarer cases, it may point to multiple myeloma, a cancer of the cells that make antibodies. A mild rise can cause no symptoms at all, while blood in the urine may be a clue with IgA nephropathy. Comparing IgA with IgG and IgM, or adding a blood test called protein electrophoresis, can help narrow things down.
Low IgA: what it may mean
Low IgA may point to selective IgA deficiency, the most common primary immunodeficiency, and many people with it can feel well. Others may get more sinus, lung or gut infections, and the condition can raise the chance of autoimmune problems. Some seizure medicines can also lower IgA. For women being checked for celiac disease, low IgA can matter a lot, because the main celiac blood test can look normal even when celiac is present. An IgG-based celiac test may be used instead.
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These notes provide context and do not diagnose a condition. Not yet available in NY, NJ, RI, HI, ND, SD or WV.