Anti-SARS-CoV-2 IgG
Anti-SARS-CoV-2 IgG measures antibodies the immune system makes after exposure to the virus that causes COVID-19, either through infection or vaccination. The IgG class typically appears in blood weeks after exposure and persists for months.
Why it matters: A positive IgG result indicates prior exposure or vaccination response. Levels do not directly translate to a specific level of protection, since immunity also involves other antibody classes and immune cells.
May increase with:
May decrease with:
What is Anti-SARS-CoV-2 IgG?
Anti-SARS-CoV-2 IgG measures antibodies the immune system makes after exposure to the virus that causes COVID-19, either through infection or vaccination. The IgG class typically appears in blood weeks after exposure and persists for months.
What might a high or low Anti-SARS-CoV-2 IgG mean?
A positive IgG result indicates prior exposure or vaccination response. Levels do not directly translate to a specific level of protection, since immunity also involves other antibody classes and immune cells.
What is the typical reference range for Anti-SARS-CoV-2 IgG?
The general-population reference range shown here is 0 – 100 U/mL. Reference ranges describe the general population and are not a personal target — discuss your results with your physician.
What can affect Anti-SARS-CoV-2 IgG?
It may be higher with: SARS-CoV-2 infection, vaccination. It may be lower with: immunocompromised states.
Track your Anti-SARS-CoV-2 IgG over time
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