The COVID-19 IgG Antibody test is intended for the qualitative detection of IgG-class antibodies against COVID-19. Current data suggest that IgM antibodies against SARS-CoV-2 develop in the circulation after the first week of COVID-19, while IgG antibodies become detectable sometime beyond 14 days of infection. A COVID-19 antibody test, also known as a serology test, is a blood test that can detect if a person has antibodies to SARS-CoV-2, the virus that causes COVID-19. A positive IgG result indicates previous infection with COVID-19 but does not indicate immunity or protection against future infection. Median time to seroconversion was 12 days after symptom onset for IgG, and all patients developed IgG by day 17. It usually takes at least 10 days after symptom onset for IgG to reach detectable levels. 3-5 after SARS-CoV-2 exposure or symptom onset. IgM antibodies to SARS-CoV-2 are generally detectable in blood several days after initial infection, with IgG antibodies typically reaching detectable levels simultaneously or 1-2 days later. Current literature suggests that detectable IgG-class antibodies against SARS-CoV-2 develop approximately 8 to 11 days following onset of symptoms. Correlation with epidemiologic risk factors and other clinical and laboratory findings is recommended. Results: Serum IgG antibodies against SARS-CoV-2 were significantly higher in COVID-19 case patients (median, 2.01 units [interquartile range, 0.16-44.33 units]) than in all persons in the control groups (median, 0.10 unit [interquartile range, 0.05-0.19 unit]; p . It can take at least two weeks after exposure to develop antibodies. COVID-19 IgG antibody testing, also known as serology testing, checks for a type of antibody called immunoglobulin G (IgG). Data suggest that IgM antibodies can be detected within a few days and IgG antibodies will be detectable from 10 days after COVID-19 symptom onset. SARS-CoV-2 Serology (COVID-19) Antibodies (IgG, IgM), Immunoassay - Detection of IgG and IgM antibodies may indicate exposure to SARS-CoV-2 (COVID-19). If you have been exposed to the virus that causes COVID-19, your body typically produces IgG antibodies as part of the immune response to the virus. 0.001).. The incubation period for COVID-19 ranges from 5 to 7 days. In general, IgM-class antibody levels rise in the first 3-7 days after viral infection, followed shortly thereafter by the development of IgG-class antibodies. 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