Immunoassay for IgG Subclass 1 (IgG1) Antibody Concentration in Serum
This test measures the amount of a specific type of antibody (IgG1) in your blood serum. Antibodies are proteins that help your immune system fight infections.
["IgG1 antibodies are part of your immune response and can be important for long-term protection against diseases."]
Key facts at a glance
- LOINC
- 42639-5
- Short code
- IC IgG SerPl C1Q Bind-aCnc
- Synonyms
- IC IgG SerPl C1Q Bind-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- c-q-binding-assay
- 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
What Does This Test Measure?
IgG1 antibodies are one of four subclasses of Immunoglobulin G (IgG), the most common antibody in your blood. This test specifically looks at the concentration of IgG1 antibodies, which play a key role in defending against bacteria and viruses. They are also involved in allergic reactions and some autoimmune conditions.
Why Might You Need This Test?
Your healthcare provider may order this test if you have symptoms or conditions related to immune system function, such as recurrent infections, autoimmune diseases, or allergies. It could also be part of monitoring treatment for conditions affecting antibody levels.
How Is the Test Performed?
A blood sample is taken from a vein in your arm. The blood is then processed to separate the serum, which is sent to a lab for testing using an immunoassay method. This method detects and measures the presence and concentration of IgG1 antibodies in your serum.
What Are Possible Results?
Results are typically reported as a concentration value (in mg/mL or similar units) compared to a reference range. However, reference ranges can vary by lab and individual factors, so your results will be interpreted by your healthcare provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
IgG1 Antibody Level
Frequently asked questions
What Does an Abnormal Result Mean?
How Often Should I Get This Test?
Can I Make Any Changes Before the Test?
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