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Immunoassay for IgG Subclass 1 (IgG1) Antibody in Serum

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of Immunoglobulin G1 (IgG1), a type of antibody in your blood. Antibodies help your immune system fight infections and other diseases.

Quick summary

["IgG1 antibodies play a key role in immune response; this test helps assess specific immune function or detect certain conditions."]

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

Key facts at a glance

LOINC
73328-7
Short code
Irbesartan ind plt IgM SerPl Ql FC
Synonyms
Irbesartan ind plt IgM SerPl Ql FC
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
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 a subset of the broader IgG class, which is the most abundant antibody in your blood. They are involved in neutralizing toxins, viruses, and bacteria. This test specifically quantifies IgG1 levels, which can vary depending on immune activity, health conditions, or immune system responses to vaccines or infections.

Why Might You Need This Test?

Doctors may order this test to evaluate immune function, diagnose or monitor conditions like autoimmune diseases, certain infections, or to assess immune responses to treatments such as vaccines or therapies.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is processed to separate serum (liquid part of blood without clotting factors) for testing. The IgG1 antibody is then measured using an immunoassay method, which detects and quantifies the specific antibody in your serum.

What Are Possible Results?

Results are presented as a concentration value of IgG1 antibodies in your serum. While reference ranges can vary slightly between labs, they typically reflect normal levels of IgG1 in healthy individuals. Abnormal results may suggest immune system issues or other health conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated IgG1 levels may indicate an active immune response, such as to an infection, vaccination, or autoimmune condition. Lower than expected levels could suggest immune deficiencies or certain chronic diseases. This test is often used in conjunction with other diagnostic tools to provide a clearer picture of your health status.

Short name

IgG1 Antibody Level

Frequently asked questions

What Does an Abnormal Result Mean?
An abnormal result doesn’t necessarily mean you have a specific disease. It may prompt further testing or evaluation by your healthcare provider to understand the underlying cause. They will consider your medical history, symptoms, and other test results when interpreting the results.
How Often Should I Get This Test?
The frequency of this test depends entirely on your healthcare provider’s recommendations. They will decide based on your health needs, symptoms, or ongoing treatment plans. Regular monitoring may be necessary if you have a chronic condition or are undergoing specific therapies.
Can I Prepare for This Test?
No special preparation is usually needed for this blood test. However, you may be asked to avoid certain medications or foods for a short time before the test, depending on your specific situation. Always follow your healthcare provider’s instructions.
  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