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SARS-CoV-2 Immunoglobulin G (IgG) Antibody Test by Rapid Immunoassay (Serum/Plasma)

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

This test detects antibodies (IgG) produced by your immune system in response to exposure to the SARS-CoV-2 virus, which causes COVID-19. IgG antibodies are part of your body’s long-term immune response.

Quick summary

["This test helps determine if you’ve had prior exposure to COVID-19, even if you didn’t experience symptoms."]

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

Key facts at a glance

LOINC
94768-9
Short code
SARS-CoV-2 IgA SerPlBld Ql IA.rapid
Synonyms
SARS-CoV-2 IgA 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 Does This Test Measure?

The test measures IgG antibodies in your blood, which develop after your body has encountered the SARS-CoV-2 virus. These antibodies are a sign that your immune system has recognized and fought the virus, often months after initial infection. IgG antibodies remain in your system for a longer period compared to other types of antibodies.

Why Might You Need This Test?

Your healthcare provider may recommend this test if you have had COVID-19 symptoms in the past, suspect recent exposure, or are part of a study or screening program. It can also be used to monitor immune response in certain clinical settings.

How Is the Test Performed?

A small blood sample is taken from your arm. The sample is processed to detect IgG antibodies using a rapid immunoassay method, which identifies the presence of these antibodies within a few minutes to hours.

What Are the Results Typically Used For?

Results can help confirm past infection, assess immune response, or guide decisions about vaccination or further testing. However, IgG alone does not confirm current infection; it only indicates prior exposure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Understanding IgG Antibodies

Short name

IgG Antibody to SARS-CoV-2 (Serum/Plasma)

Frequently asked questions

What does a positive result mean?
A positive result suggests that your immune system has recognized and produced IgG antibodies in response to SARS-CoV-2, indicating prior exposure to the virus. This does not guarantee immunity but may indicate some level of immunity that could be protective over time.
Can this test tell me if I have COVID-19 now?
No, this test only detects IgG antibodies, which are markers of past infection. For current infection, you would need a different type of test, such as a viral test (e.g., PCR or antigen test).
How long do IgG antibodies last?
IgG antibodies can persist in your system for months to years after infection. However, their levels may decrease over time, and they do not provide lifelong immunity. Vaccination can boost and sustain antibody levels for protection against future infections.
  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