Covid-19 IgM antibody can be used to help detect acute infections; IgM antibody is the first antibody produced after infection with Covid-19.
For people with Covid-19 IgM positive, PCR test to measure Covid-19 RNA and lung tomography to see the condition of the lungs are recommended.
Covid-19 IgG antibody is used to show the acute infection period and memorized immunity.
Covid-19 IgG antibody positivity does not mean that permanent immunity has occurred. Still, it shows that the body is more protected than a person who has no antibodies formed. It is especially useful for understanding whether antibodies have been formed as a result of vaccination studies.