Serum SARS-CoV-2 IgG Antibody (Quantitative)

What Does This Test Measure?

IgG antibodies are a type of antibody your immune system creates after you’ve been exposed to the SARS-CoV-2 virus. They develop several weeks after infection and can stay in your system for months or longer, providing long-term immunity. This test helps determine if your body has produced these antibodies, which may indicate past infection.

Why Might You Need This Test?

Doctors may order this test to confirm past COVID-19 infection, assess immunity in vaccinated individuals, or evaluate immune response in people who’ve recovered from COVID-19. It’s also sometimes used in research or clinical studies to track antibody levels over time.

How Is This Test Performed?

A blood sample is taken from a vein in your arm. The sample is then sent to a lab for analysis using an immunoassay method, which detects the presence and concentration of IgG antibodies specific to SARS-CoV-2.

What Are the Possible Results?

Results are typically reported as a quantitative measurement of antibody concentration. A positive result means detectable IgG antibodies are present, suggesting past infection. A negative result means no detectable antibodies were found, which may indicate no prior infection or insufficient time since exposure.