Skip to content

Quantitative 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, often checked to evaluate immune function or screen for conditions like IgA nephropathy.

Quick summary

["IgA helps protect your body from infections and is important for immune health."]

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

Key facts at a glance

LOINC
9967-1
Short code
QRS I-Amp L-V1
Synonyms
QRS I-Amp L-V1
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ekg
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 order this test if you have symptoms of an immune-related condition, such as frequent infections, unexplained bleeding, or if they suspect a condition like IgA deficiency or IgA nephropathy. It may also be part of a routine checkup or screening for certain diseases.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw blood, and you’ll rest for a few minutes afterward. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Results are compared to a general reference range for healthy adults, but your specific range may vary based on age, health status, and other factors. Very low or very high levels might indicate an underlying health issue that needs further evaluation.

Common Conditions Related to IgA Levels

Low IgA levels may suggest an immune system disorder, such as selective IgA deficiency, which can increase susceptibility to infections. High IgA levels might be seen in certain autoimmune conditions or chronic infections, but this isn’t always straightforward.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgA Level

Frequently asked questions

What causes IgA levels to be low or high?
Low IgA levels can occur due to genetic factors, immune system disorders, or certain medications. High IgA levels may be linked to chronic infections, autoimmune diseases, or other health conditions. Your provider will discuss potential causes based on your medical history and symptoms.
How often should I get this test?
The frequency depends on your health needs. If you have a known condition affecting IgA, your provider may recommend regular monitoring. Otherwise, this test is often done only when symptoms or concerns arise.
Can diet or lifestyle affect IgA levels?
Diet and lifestyle factors like nutrition, stress, and infections can influence immune function, but they don’t directly change IgA levels. Focus on maintaining a balanced diet and good overall health to support your immune system.
  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