Immunoassay for Total Immunoglobulin G (IgG) in Serum/Plasma
This test measures the amount of Immunoglobulin G (IgG), a type of antibody found in your blood. IgG helps protect your body from infections and diseases.
["IgG helps fight infections and supports long-term immunity."]
Key facts at a glance
- LOINC
- 17581-0
- Short code
- GQ1b Gangl IgM Ser Ql
- Synonyms
- GQ1b Gangl IgM Ser Ql
- 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 to check for low or high levels of IgG, which can happen due to immune system issues, certain medical conditions, or after treatments like chemotherapy. It may also be used to monitor immune function in people with chronic illnesses or those who have had organ transplants.
What to Expect Before the Test
No special preparation is usually needed. You may have a small needle inserted into your arm or vein to draw blood. If you’re taking blood from your arm, you might feel a slight pinch. If you’re having a blood draw from your vein, you may feel a small pinch or pressure.
What to Expect During the Test
The blood sample will be sent to a lab for testing. Results are typically available within a few days, depending on lab processes. Your healthcare provider will discuss the results with you.
Possible Results and Their Meaning
Results may show low IgG levels, which could indicate a weakened immune system, or high levels, which might be linked to certain autoimmune conditions or overactive immune responses. Your provider will interpret the results in the context of your health history.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
IgG levels are crucial for diagnosing and managing conditions like immunodeficiency, autoimmune diseases, or chronic infections. Low IgG can mean your body struggles to fight infections, while high IgG might suggest overactive immune responses or certain diseases like multiple myeloma.
Short name
IgG Level Test
Frequently asked questions
How long does it take to get the results of this test?
What does it mean if my IgG level is low?
Can diet affect my IgG levels?
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