Immunoglobulin A IgA Test

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About Our Immunoglobulin A IgA Test

The Immunoglobulin A Blood Test measures the level of IgA, one of the body’s most important antibodies involved in immune defense. IgA is found primarily in blood, saliva, tears, and mucosal surfaces of the respiratory and gastrointestinal tracts, where it plays a critical role in protecting the body from infections.

IgA helps prevent bacteria, viruses, and toxins from attaching to and penetrating mucosal surfaces. Because of this frontline role, abnormal IgA levels can signal issues related to immune function, infection, inflammation, or nutrient absorption.

Elevated IgA levels may be associated with chronic infections, inflammatory conditions, gastrointestinal disorders, or certain plasma cell disorders such as monoclonal IgA myeloma. Persistently high levels often prompt further evaluation to determine the underlying cause.

Low IgA levels may indicate selective IgA deficiency, one of the most common primary immunodeficiency conditions, or rare genetic disorders such as ataxia telangiectasia. Identifying abnormal IgA levels helps guide further immune assessment and clinical decision-making.

What Is Included In This Test?

This test measures the concentration of immunoglobulin A in the blood.

Your results can help:

• Evaluate immune system function
• Identify immune deficiencies or overactivity
• Support diagnosis of chronic infections
• Assess gastrointestinal or respiratory immune health
• Guide further immunologic testing

Why Does This Test Matter?

IgA plays a central role in immune defense at mucosal surfaces, which are common entry points for pathogens. Abnormal levels can increase susceptibility to infections or signal ongoing immune system activation.

Low IgA levels may explain recurrent respiratory or gastrointestinal infections and may affect the accuracy of other antibody-based tests. Identifying IgA deficiency allows for appropriate monitoring and preventive care.

High IgA levels can reflect chronic immune stimulation, inflammation, or more serious conditions that require follow-up testing. Monitoring IgA helps clarify the cause of unexplained symptoms or abnormal lab findings.

This test provides valuable insight into immune balance and supports early detection of immune-related conditions before complications develop.

Who Should Consider This Test?

This test is ideal for individuals with symptoms or conditions related to immune function.

You should consider this test if you:

• Experience frequent respiratory or gastrointestinal infections
• Have chronic digestive issues or malabsorption
• Have abnormal immune or protein test results
• Are being evaluated for immune deficiency
• Have unexplained inflammation or fatigue
• Need immune system assessment as part of broader testing

Understanding IgA levels helps support accurate diagnosis and personalized care.

Convenient, No-Appointment Testing

To complete your test:

Order online through our website
Use the lab locator to find a nearby testing location
Walk in; no appointment required
Access your results securely in your HealthLabs.com account within one to three business days

110% Price Guarantee!

If you find the same test for a lower price from a comparable provider, contact us. We not only match the price, we beat it by an additional 10 percent of the difference.

Common Questions:

Why is IgA important?

IgA protects mucosal surfaces such as the gut and airways from infection.

What does high IgA indicate?

It may be linked to chronic infection inflammation or certain immune disorders.

Will anyone see my results besides me?

Your results are stored in your secure online account. They are not shared with anyone else. If you choose, you can print or download them to share with your own doctor.

Do I need to fast before this test?

Fasting is not required for this test. You can eat and drink normally unless your doctor has given you other instructions.

Can I talk to someone about my results?

Yes. If your results come back abnormal or if you simply have questions, our team is here to support you. You can text our Patient Services team at 1800-579-3914.

Can I use insurance to pay for this test?

In order to ensure your privacy, we do not bill insurance directly, but you may use HSA or FSA funds. This keeps your results and testing completely private from insurers. We can also provide you with an itemized receipt for insurance reimbursement purposes if you need it.