Immunoglobulin G (IgG) Subclass 2 Concentration (Serum/Plasma)
This test measures the amount of Immunoglobulin G (IgG) subclass 2 antibodies in your blood. IgG is part of your immune system and helps fight infections.
["IgG2 levels help doctors understand how well your immune system is producing this specific type of antibody."]
Key facts at a glance
- LOINC
- 13312-4
- Short code
- IgA IgG SerPl-aCnc
- Synonyms
- IgA IgG SerPl-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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 order this test if you have symptoms of a weakened immune system, recurrent infections, or conditions like asthma, allergies, or certain autoimmune diseases. It may also be used to monitor treatment responses in conditions affecting antibody production.
What to Expect Before the Test
No special preparation is needed. You may have a small needle inserted into a vein in your arm, and a blood sample will be drawn. This is usually done in a clinic or lab setting.
What the Test Results Mean
Results may be compared to a reference range to see if your IgG2 levels are within normal limits or if they are lower or higher than expected. Lower levels might suggest immune system issues, while higher levels could indicate other health conditions or immune responses.
Common Conditions Related to IgG2 Levels
IgG2 deficiency can make it harder for your body to fight certain types of infections, especially those caused by bacteria like *Streptococcus* or *Pneumococcus*. Conditions like asthma or allergies might also be associated with variations in IgG2 levels.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
IgG2 plays a role in protecting against certain bacterial infections and allergic responses. Low IgG2 levels can indicate a specific immune deficiency that may require further evaluation or treatment, such as immune-boosting therapies. High levels may be seen in chronic infections, autoimmune diseases, or other immune system activations.
Short name
IgG2 Level
Frequently asked questions
What does a low IgG2 level mean?
How is IgG2 tested?
Can IgG2 levels change over time?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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