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Immunoglobulin A (IgA) in serum/plasma

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 bacteria and viruses.

Quick summary

["IgA helps defend your immune system and may be checked if you have concerns about infections or immune-related conditions."]

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

Key facts at a glance

LOINC
54098-9
Short code
IMPA Ur-mCnc
Synonyms
IMPA Ur-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Does This Test Measure?

IgA is one of the key proteins in your immune system. It plays a role in preventing infections by binding to pathogens like bacteria and viruses before they can enter your body. Levels can vary depending on your health, immune function, and exposure to infections.

Why Might You Need This Test?

Doctors may order an IgA test to diagnose or monitor conditions such as immune deficiencies, certain autoimmune diseases, or infections. It can also be part of a broader evaluation for conditions like IgA nephropathy or other immune-related disorders.

Common Reasons for Testing

Common reasons include checking for immune system function, diagnosing conditions like IgA deficiency, evaluating symptoms of recurrent infections, or assessing kidney function in cases of IgA-related kidney disease.

What to Expect Before the Test

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

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgA Level

Frequently asked questions

How long does it take to get my results?
Results are typically available within a few days to a week, depending on your lab. Your healthcare provider will discuss the results with you.
Can low or high IgA levels indicate a problem?
Yes, very low IgA levels might suggest an immune deficiency or certain autoimmune conditions. Very high levels could be associated with certain infections, inflammatory diseases, or other health issues. Your doctor will interpret the results in the context of your overall health.
Is there anything I should avoid before this test?
Avoid heavy meals or excessive alcohol before the blood draw, as this may affect blood flow. If you are on any medications, especially blood thinners, inform your healthcare provider beforehand.
  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