What does a novel coronavirus IgG antibody level of 1.88 mean?
Dec 10, 2025
Source: Cainiu Health
Dr. Ren Yi
Introduction
An IgG antibody level of 1.88 for the novel coronavirus often indicates a previous infection or vaccination-induced immunity, and whether the result is positive should be determined by comparing it with the reference value. If the test reference value is below 1.88, this value is considered positive, indicating the presence of protective antibodies against the coronavirus in the body. This may result from recovery after a past infection or from an immune response following vaccination.
Under normal circumstances, a COVID-19 IgG antibody level of 1.88 or higher usually indicates prior infection or immunity developed after vaccination. Whether the result is positive should be determined by comparing it with the reference range. If in doubt, it is recommended to consult a doctor in advance. Detailed analysis is as follows:
If the test result is below the reference value of 1.88, the result is considered positive, indicating the presence of protective antibodies against the SARS-CoV-2 virus. These antibodies may have been produced following recovery from a previous infection or as an immune response after vaccination, suggesting that the body has some degree of resistance to the virus.
If the reference value is above 1.88, the result is negative, meaning that no relevant antibodies were detected. This could indicate that the person has neither been infected nor vaccinated, or that the vaccination did not successfully trigger antibody production, resulting in weaker immunity against the virus.
Antibody test results should be interpreted by combining the reference values with clinical context. A single numerical value alone cannot fully reflect the individual's immune status. Interpretation of results and follow-up preventive measures should follow the advice of qualified healthcare professionals.
