Serology tests are blood-based essays that can be practiced to identify whether people have been displayed to a particular pathogen. Serology-based tests examine the serum ingredient of whole blood. Serology testing for COVID-19 is significant because of the comparatively short time to investigation and the capacity to test for an active immune response against the virus. Serology tests have changeable sensitivity and specificity, and also EUA allowed tests should not be the individual basis of diagnosis. The CDC currently suggests using molecular testing (PCR, antigen) to diagnose SARS-CoV-2 infections.