{"id":"anti-hbs","name":"Hepatitis B Surface Antibody (Anti-HBs)","shortName":"Anti-HBs","aliases":["Hepatitis B Surface Antibody","Anti-HBs","HBsAb","Hepatitis B Surface Ab, Quantitative","Hep B Surface Ab","HBs-Antikörper","Anticuerpos anti-HBs","Hepatitis B Surface Antibody, Quantitative","Hepatitis B Surface Antibody, Qualitative","HBs Antibody","HBsAb Quantitative","Anti-HBs Quant","Hepatitis B Surface Ab","HBs Ab","Hepatitis B Virus Surface Antibody","HBs Antibody, Quantitative","Hep B Surf Ab","Hepatitis B Antibody, Surface"],"abbreviations":["Anti-HBs","HBsAb","HBs Ab"],"loinc":[{"code":"5193-8","primary":true},{"code":"16935-9","primary":false},{"code":"10900-9","primary":false},{"code":"22322-2","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"m[IU]/mL","display":"mIU/mL"},{"ucum":"[IU]/L","display":"IU/L"}],"referenceRanges":[{"population":"Adults","low":10,"high":null,"unit":"m[IU]/mL","unitDisplay":"mIU/mL","note":"This is the antibody level generally treated as protective, not an interval from healthy people. Mayo Clinic Laboratories lists below 10.0 mIU/mL as the expected result for unvaccinated people and 10.0 mIU/mL or higher for vaccinated people. ACIP (2018) calls 10 mIU/mL or higher seroprotective, and the CDC testing page says immune above 10 mIU/mL after a completed vaccine series. This file treats 10 as included. Some assays have their own cutoffs or an equivocal zone, so follow the flag on your lab report.","sources":[{"title":"Hepatitis B Virus Surface Antibody Screen, Qualitative/Quantitative, Serum (test HBBSN)","url":"https://testcatalog.org/show/HBBSN","publisher":"Mayo Clinic Laboratories (Extended Catalog)"},{"title":"Clinical Testing and Diagnosis for Hepatitis B","url":"https://www.cdc.gov/hepatitis-b/hcp/diagnosis-testing/index.html","publisher":"CDC"},{"title":"Prevention of Hepatitis B Virus Infection in the United States: Recommendations of the Advisory Committee on Immunization Practices","url":"https://www.cdc.gov/mmwr/volumes/67/rr/rr6701a1.htm","publisher":"MMWR Recommendations and Reports (CDC)","year":2018}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"The antibody that protects against hepatitis B. A result of 10 mIU/mL or higher is generally treated as protected, from vaccination or past infection.","url":"https://bloodtesttracker.com/markers/anti-hbs","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}