SARS-CoV-2 Immunoglobulin G (IgG) Antibody Test by Rapid Plasma Reagent (RPR) Method
This test detects antibodies in your blood that your immune system produces in response to exposure to the virus that causes COVID-19. It helps determine if you had prior infection, even if you never had symptoms.
["This test checks for antibodies that may indicate past COVID-19 exposure, aiding in understanding immunity status or past infection."]
Key facts at a glance
- LOINC
- 94507-1
- Short code
- SARS-CoV-2 IgG SerPlBld Ql IA.rapid
- Synonyms
- SARS-CoV-2 IgG SerPlBld Ql IA.rapid
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia-rapid
- 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 This Test Measures
The test looks for IgG antibodies, a type of protein your immune system makes after encountering the SARS-CoV-2 virus. These antibodies can stay in your blood for months or years after infection, helping your body fight future infections. This test uses a rapid plasma reagent method, which provides results quickly through a simple blood draw.
How the Test Works
Your blood sample is tested using a rapid immunoassay technique. This method detects IgG antibodies that bind to viral proteins, indicating prior exposure. Results are typically available within minutes, though confirmation may require follow-up testing.
Why It’s Done
Doctors may order this test to assess whether you’ve developed immunity after recovering from COVID-19, evaluate exposure risk in high-risk individuals, or guide decisions about vaccination status. It’s also used in screening for past infection in healthcare or travel settings.
What to Expect Before the Test
No special preparation is needed. You’ll have a small blood sample drawn from your arm, similar to a routine blood test. Wear comfortable clothing and arrive with an empty stomach if instructed, though this is not always required for this test.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive results suggest you’ve likely had COVID-19 and may have some level of immunity. However, IgG alone does not guarantee protection against future infection. Negative results mean no detectable IgG antibodies were found, indicating either no prior exposure or insufficient time for antibody development. This test should not replace medical advice or current vaccination status.
Short name
IgG Antibody to SARS-CoV-2 (Rapid Test)
Frequently asked questions
How long do IgG antibodies from COVID-19 last?
Can this test be used to confirm a recent COVID-19 infection?
Does a positive IgG test mean I’m immune to COVID-19?
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