Miscellaneous
It seems like SARS-CoV-2 antibody tests should be pretty simple. Tests consist of SARS-CoV-2 antigens on a plate. If a person has antibodies for SARS-CoV-2, their antibodies bind to the antigens, and the test reads as positive. However, it is possible to get a false positive if some other antibody can bind by coincidence to the antigen.