The NAB-Sure SARS-CoV-2 assay is a competitive binding assay that uses SPEAR technology. It is a surrogate virus neutralization test (sVNT), which measures the ability of antibodies in a sample to block SARS-CoV-2 Spike Protein from binding to the ACE2 receptor protein in solution. The assay is accurate, highly sensitive, and compares favorably with existing neutralizing antibodies assays.