Serum Immunoglobulin G (IgG) Level, 2 Weeks Before COVID-19 Outbreak
This test measures the amount of Immunoglobulin G (IgG), a type of antibody in your blood, taken 2 weeks before the COVID-19 outbreak. IgG helps your body fight infections and is often checked to understand immune response.
IgG antibodies can indicate past exposure to COVID-19 or other infections.
Key facts at a glance
- LOINC
- 97110-1
- Short code
- WORKSETTINGINTHE2WBEFORETHECOVID19OUTBREAK
- Synonyms
- —
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 3.5
- Ref high
- 5
- Critical range
- 2.5 N/A – 6.5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 84132
- SNOMED
- 110742001
- 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?
IgG antibodies are a key part of your immune system. They are produced by your body in response to infections, including COVID-19. This test helps determine if your body has developed these antibodies, which can provide insight into your immune response to prior exposure or vaccination.
Why Was This Test Ordered?
Your healthcare provider may have ordered this test to assess your immune status before the COVID-19 outbreak. It could be part of a broader evaluation to understand your risk factors, immune response, or to support research or screening efforts.
What Does a Positive Result Mean?
A positive result suggests your body has produced IgG antibodies, which may indicate past exposure to COVID-19 or another infection. This does not confirm current infection but can help track immune history.
What Does a Negative Result Mean?
A negative result means IgG antibodies were not detected in your blood at the time of testing. This does not rule out past exposure or immunity, as antibody levels can vary over time.
Reference range
Adult: 3.5-5.0 mmol/LN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: Understanding IgG Antibodies in Context
Short name
IgG Antibody Profile (Serum)
Frequently asked questions
How long do IgG antibodies last after COVID-19 infection?
Can this test be used to diagnose COVID-19?
What if my IgG levels are low?
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