Lab test
IgA Lab Test - Immunoglobulin A Testing
An immunoglobulin A (IgA) test measures the amount of IgA in the blood.
- Typical price
- From $45
- Results
- 1-3 business days
- Preparation
- See preparation notes below
- Sample
- Blood draw or sample collection at a local center
About this test
An immunoglobulin A (IgA) test measures the amount of IgA in the blood. IgA is an antibody that protects the mucous membranes lining the respiratory and digestive tracts, and it is one of the body's main antibody types. Clinicians order total IgA when they suspect an immune deficiency, when a person has frequent respiratory or gastrointestinal infections, or when they want to evaluate malabsorption or certain autoimmune conditions. The result is a screening measurement, not a diagnosis, and is interpreted with symptoms and other immune tests. A healthcare provider can explain what your IgA level means in context.
What this test measures
- Immunoglobulin A (total serum IgA) An antibody that protects mucous membranes; its blood level helps assess immune function and is used to evaluate recurrent infections or malabsorption.
Who this test may be right for
- People with frequent or recurring respiratory or gastrointestinal infections
- Individuals with unexplained malabsorption, chronic diarrhea, or poor growth
- Those with a healthcare provider evaluating a possible immune deficiency
- People being assessed alongside celiac or autoimmune testing
- Anyone with a family history of antibody deficiency
Before your visit
- No fasting is required for this test
- A standard blood draw is used to collect the sample
- Tell the lab about medications, especially those that affect the immune system
- Follow any instructions provided with your test order
Understanding your results
A low total IgA level may indicate an IgA deficiency, which can be associated with recurrent infections and with certain digestive conditions. Because IgA deficiency can affect the interpretation of some other antibody tests, it is often reviewed in that context. A high IgA level can be associated with infections, inflammatory or autoimmune conditions, and some liver disorders. Total IgA is a screening tool, so discuss your result with a healthcare provider, who can arrange further testing if appropriate.
Order this test online
- Buy online in a few minutes - no doctor's visit needed for most tests.
- Sample collection at a patient service center near you.
- Results are typically ready within 1-3 business days.
- Secure, lab-reviewed results delivered to your account.
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Questions people ask
What does the IgA test measure?
It measures the level of immunoglobulin A, an antibody that protects the mucous membranes of the respiratory and digestive tracts, in the blood.
Why does a low IgA level matter for other tests?
If total IgA is low, tests that rely on IgA antibodies, such as certain celiac tests, may be less reliable. That is why a healthcare provider may check total IgA alongside them.
Is fasting required for an IgA test?
No. The immunoglobulin A blood test does not require fasting, and the sample is collected with a standard blood draw.
What does the IgA Lab Test - Immunoglobulin A Testing measure?
Our IgA test is used to measure the level of immunoglobulin A.
Do I need to fast before this test?
Follow the lab's instructions.
How long do results take?
Most IgA Lab Test - Immunoglobulin A Testing results are released in 1-3 business days. Specialty testing can take longer.
Is this test right for me?
This page is educational and not medical advice. Talk to a licensed healthcare provider about which tests fit your situation.
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