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Serum IgA (Immunoglobulin A) Concentration

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 levels help assess immune function and detect potential immune deficiencies or autoimmune conditions."]

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

Key facts at a glance

LOINC
95704-3
Short code
SINV IgA Spec Ql IA
Synonyms
SINV 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 allergies, or conditions linked to low IgA levels. It might also be used to monitor immune responses in certain diseases or before certain treatments.

What to Expect Before the Test

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

What the Test Results Mean

Results are compared to a general range for healthy adults. Low IgA levels may suggest immune issues, while very high levels could indicate certain autoimmune diseases or chronic infections.

Common Conditions Linked to IgA Levels

Low IgA is sometimes seen in conditions like Common Variable Immunodeficiency (CVID) or after certain treatments like chemotherapy. High IgA can be linked to autoimmune disorders like lupus or chronic infections.

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?
IgA deficiency can result from genetic factors, certain medications, chronic illnesses, or weakened immune systems. It’s important to discuss symptoms like frequent infections with your provider.
How often should IgA levels be checked?
Your provider will determine the best timing based on your symptoms or medical history. Regular monitoring may be needed if you have a known immune disorder or are undergoing treatments that affect immunity.
Can diet affect IgA levels?
Diet generally doesn’t directly impact IgA levels, but maintaining a balanced diet supports overall immune health. If you suspect diet-related concerns, talk to your provider.
  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