COVID-19 IgG Antibody to SARS-CoV-2 (Serum) – Mass Concentration

What Does This Test Measure?

IgG antibodies are a type of protein your immune system makes after encountering the COVID-19 virus. These antibodies are part of your body’s defense system and can remain in your blood for months or even years after infection. This test specifically looks for IgG antibodies against the spike protein of the SARS-CoV-2 virus, which is responsible for causing COVID-19. The result indicates whether your immune system has recognized and responded to the virus.

Why Might You Need This Test?

Healthcare providers may recommend this test if you have had COVID-19 symptoms, have been exposed to someone with COVID-19, or if you are recovering from a COVID-19 infection. It can also be used for screening in certain settings, such as before returning to work or travel, or for monitoring immunity in high-risk groups.

How Is This Test Performed?

A blood sample is drawn from a vein in your arm. The serum portion of the blood is then tested in a laboratory using an immunoassay method to detect the presence of IgG antibodies. The test does not measure the current viral load or active infection but rather past exposure.

What Are the Possible Results?

A positive result means your blood contains IgG antibodies to SARS-CoV-2, suggesting you likely had COVID-19 at some point and may have developed immunity. A negative result means no detectable IgG antibodies were found, indicating either no prior exposure or insufficient time since exposure for antibodies to develop. Results should be interpreted by a healthcare provider in the context of your medical history and symptoms.