IgA Lab Test
IgA Lab Test is a laboratory test you can order directly. The IgA lab test measures the amount of immunoglobulin A (IgA), an antibody that helps protect mucous membranes in the respiratory and digestive tracts. It is ordered to evaluate immune function, screen for IgA deficiency, or monitor conditions like celiac disease and chronic infections.
- Sample type
- blood
- Category
- Protein
- Turnaround
- 1-3 business days
- Price
- $45
- Referral
- Not required
The IgA lab test measures the amount of immunoglobulin A (IgA), an antibody that helps protect mucous membranes in the respiratory and digestive tracts. It is ordered to evaluate immune function, screen for IgA deficiency, or monitor conditions like celiac disease and chronic infections.
What it measures
- Total IgA — Overall level of IgA antibody in the blood.
- IgA subclass 1 — One of two subtypes; helps pinpoint specific deficiencies.
- IgA subclass 2 — The other subtype; often checked if total IgA is low.
Who it is for
A doctor may order this test if you have frequent infections, digestive problems, or symptoms suggesting an immune disorder. It is also used before certain celiac disease tests that rely on IgA.
Preparation
No fasting or special preparation is needed. Tell your doctor about any medications or recent illnesses, as they can affect results.
Results and what they mean
Results are reported as a number with a reference range, typically in milligrams per deciliter (mg/dL). Your clinician interprets the value along with your symptoms and other tests. This is general information, not medical advice; discuss your results with a healthcare professional.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the iga lab test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
What does a low IgA result mean?
It may indicate IgA deficiency, which can be inherited or linked to other conditions. Some people with low IgA have no symptoms, but your doctor will evaluate further.
Can I eat before the test?
Yes, no fasting is required. Eat and drink normally unless your doctor gives other instructions.
How long do results take?
Typically 1–3 business days, but this can vary by lab and location.
Is this test covered by insurance?
Coverage depends on your plan and medical necessity. Check with your insurance provider before testing.