{"id":"sars-cov-2-spike-antibody","name":"SARS-CoV-2 spike (S) antibody","shortName":"COVID spike antibody","aliases":["SARS-CoV-2 Spike Antibody","COVID-19 Spike Ab","SARS-CoV-2 S Antibody, Semiquantitative","COVID-19 IgG Spike","SARS-CoV-2 Total Antibody, Spike, Semi-Quantitative","SARS-CoV-2 Spike Antibody, Semi-Quantitative","SARS-CoV-2 Spike Ab, Semi-Quant","SARS-CoV-2 Spike Ab, Semi-Quant, S","SARS-CoV-2 Spike Ab, Quant, S","Elecsys Anti-SARS-CoV-2 S","Anti-SARS-CoV-2 S","COVID-19 Antibody, Spike","SARS-CoV-2 Semi-Quant Total Ab","COVID-19 Spike Total Antibody"],"abbreviations":["Anti-S","Spike Ab","anti-SARS-CoV-2 S"],"loinc":[{"code":"94769-7","primary":true},{"code":"94505-5","primary":false},{"code":"99597-7","primary":false},{"code":"94661-6","primary":false}],"specimen":"serum","units":[{"ucum":"[arb'U]/mL","display":"U/mL"}],"referenceRanges":[],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures antibodies to the virus's spike protein, which rise after COVID-19 vaccination or infection. No number is a proven sign of protection.","url":"https://bloodtesttracker.com/markers/sars-cov-2-spike-antibody","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}