Neocoronavirus antibodies are specific antibodies produced by the body after infection with Neocoronavirus or vaccination against Neocoronavirus. There are two types: IgM and IgG. The reference values for both IgM and IgG are generally 0-1g/L for negative and over 1g/L for positive. However, the reference value for IgG should also be determined by the reagents used for each checkpoint. 1. IgM antibody: It appears earlier and can be detected in the serum at the early stage of infection with the new coronavirus. Positive IgM antibody indicates that the human body has been infected with the virus in the recent two weeks to one month or so, and it is contagious and needs to be quarantined. 2. IgG antibodies: appear late, appear one week after infection, IgG antibody positive indicates that the human body has been infected with the new coronavirus within three to six months. Quarantine is required when the IgG antibody is positive and the IgM or nucleic acid of the new coronavirus is positive, but only the IgG antibody is positive and does not require quarantine. If the IgM antibody is negative and the IgG antibody is positive, it means that the patient has been infected with neocoronavirus before but is now cured and can be released from quarantine, or the vaccination was successful and antibodies were produced, so quarantine is not needed. Interpreting Neocoronavirus antibody values should still be done in the hospital seeking guidance from a medical professional.