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Serum Immunoglobulin A (IgA) Level

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of Immunoglobulin A (IgA), a type of antibody in your blood. IgA helps protect your body from infections by fighting germs that enter through mucous membranes, such as those in your nose, throat, and digestive tract.

Quick summary

["IgA helps defend against common infections and plays a role in immune system function."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
95694-6
Short code
CVV IgA Spec Ql IA
Synonyms
CVV IgA Spec Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like frequent infections, unexplained rashes, or if they suspect an immune-related condition. It can also be part of a broader evaluation for conditions like immunodeficiency, autoimmune diseases, or certain digestive disorders.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into your arm to draw blood. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Results help determine if your IgA levels are within a typical range or if they’re too high or low. Low IgA levels might indicate a weakened immune response, while very high levels could suggest certain health conditions or immune system responses.

Common Conditions Linked to IgA Levels

Low IgA levels may be associated with conditions like Common Variable Immunodeficiency (CVID) or other immune deficiencies. High IgA levels can sometimes be linked to autoimmune diseases, infections, or certain types of inflammatory conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgA Blood Test

Frequently asked questions

What causes IgA levels to be low?
Low IgA levels can result from genetic factors, certain infections, autoimmune diseases, or conditions that affect the immune system, such as CVID. Some medications or chronic illnesses may also influence IgA production.
How often should I get this test?
The frequency depends on your health status. If you have a known condition affecting IgA, your doctor may recommend periodic testing. Otherwise, this test is usually done only when symptoms or concerns arise.
Can IgA levels change over time?
Yes, IgA levels can fluctuate due to infections, immune responses, or underlying health conditions. If your levels are abnormal, your doctor may monitor them closely to track changes or guide treatment decisions.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy