Covid-19 Spike Protein Antibody Test - COVSQ

This test measures antibodies directed against the SARS-CoV-2 spike (S) protein, the main target of both infection- and vaccine-induced immunity. It provides a semi-quantitative result, indicating the presence and relative concentration of spike-specific IgG antibodies. The assay caps at 250 U/mL, with higher readings reported as “>250 U/mL,” reflecting strong antibody presence.