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. A positive IgG result indicates previous infection with COVID-19 but does not indicate immunity or protection against future infection. 3-5 after SARS-CoV-2 exposure or symptom onset. COVID-19 IgG antibody testing, also known as serology testing, checks for a type of antibody called immunoglobulin G (IgG). 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. Current literature suggests that detectable IgG-class antibodies against SARS-CoV-2 develop approximately 8 to 11 days following onset of symptoms. 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. Correlation with epidemiologic risk factors and other clinical and laboratory findings is recommended. The COVID-19 IgG Antibody test is intended for the qualitative detection of IgG-class antibodies against COVID-19. 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. Currently, the most widely used method for diagnosing COVID-19 is the standard M PCR. There are an emerging amount of IgG and IgM antibody tests for COVID-19 that are being developed and presented to clinicians. SARS-CoV-2 Serology (COVID-19) Antibody (IgG), Immunoassay - Detection IgG antibodies may indicate exposure to SARS-CoV-2 (COVID-19). It usually takes at least 10 days after symptom onset for IgG to reach detectable levels. 0.001).. This test is the most sensitive testing method and can identify the virus before symptoms are expressed. It can take at least two weeks after exposure to develop antibodies. 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. https://asm.org/Articles/2020/May/COVID-19-Serology-Testing-Explained 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 . 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. The incubation period for COVID-19 ranges from 5 to 7 days. 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