Identifying previous exposure to hepatitis B virus
Determining adequate immunity from hepatitis B vaccination
This assay provides both qualitative and quantitative results.
This diagnostic test should be used for testing individuals to evaluate post-vaccination immunity status or post-acute infection status of hepatitis B virus.
For more information see Hepatitis B: Testing Algorithm for Screening, Diagnosis, and Management
Electrochemiluminescence Immunoassay (ECLIA)
Antibody to Hepatitis B Surface Ag
HBsAb
Hepatitis B Surface Antibody
Hepatitis B Surface Antibody-Quant
Hepatitis Bs Ab
Anti-HBs
HBAB
Hepatitis B Surface Ab
For more information see Hepatitis B: Testing Algorithm for Screening, Diagnosis, and Management
Serum SST
If patient is being monitored for hepatitis B immune globulin (HBIG) therapy after organ transplantation, order HBABT / Hepatitis B Virus Surface Antibody Monitor, Post-Transplant, Serum.
This test should not be used for screening asymptomatic, nonpregnant individuals with or without risk factors for hepatitis B virus (HBV) infection. For screening such patients, order HBBSN / Hepatitis B Virus Surface Antibody Screen, Qualitative/Quantitative, Serum.
This test should not be used for prenatal screening of pregnant individuals with or without risk factors for HBV infection. For screening such patients, order HBABP / Hepatitis B Virus Surface Antibody Prenatal, Qualitative/Quantitative, Serum.
Date of collection is required.
Patient Preparation: For 24 hours before specimen collection, patient should not take multivitamins or dietary supplements (eg, hair, skin, and nail supplements) containing biotin (vitamin B7).
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube: Serum gel
Submission Container/Tube: Plastic vial
Specimen Volume: 0.7 mL
Collection Instructions:
1. Centrifuge blood collection tube per manufacturer's instructions (eg, centrifuge and aliquot within 2 hours of collection for BD Vacutainer tubes).
2. Aliquot serum into a plastic vial.
If not ordering electronically, complete, print, and send 1 of the following:
0.6 mL
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | Reject |
| Heat-inactivated specimen | Reject |
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum SST | Ambient | 7 hours | |
| Refrigerated | 6 days | ||
| Frozen (preferred) | 90 days |
Identifying previous exposure to hepatitis B virus
Determining adequate immunity from hepatitis B vaccination
For more information see Hepatitis B: Testing Algorithm for Screening, Diagnosis, and Management
Hepatitis B virus (HBV) is a DNA virus that is endemic throughout the world. The infection is spread primarily through blood transfusion or percutaneous contact with infected blood products, such as sharing of needles among injection drug users. The virus is found in virtually every type of human body fluid and has been known to be spread through oral and genital contact. HBV can be transmitted from mother to child during delivery through contact with blood and vaginal secretions, but it is not commonly transmitted via the transplacental route.
The incubation period for HBV infection averages 60 to 90 days (range of 45-180 days). Common symptoms include malaise, fever, gastroenteritis, and jaundice (icterus). After acute infection, HBV infection becomes chronic in 30% to 90% of infected children younger than 5 years and in 5% to 10% of infected individuals 5 years or older. Some of these chronic carriers are asymptomatic, while others progress to chronic liver disease, including cirrhosis and hepatocellular carcinoma.
Hepatitis B surface antigen (HBsAg) is the first serologic marker, appearing in the serum 6 to 8 weeks following HBV infection. In acute cases, HBsAg usually disappears 1 to 2 months after the onset of symptoms with the appearance of HBs antibody (anti-HBs). Anti-HBs also appears as the immune response following hepatitis B vaccination.
Hepatitis B Surface Antibody
Unvaccinated: Negative
Vaccinated: Positive
Hepatitis B Surface Antibody, Quantitative
Unvaccinated: <8.5 mIU/mL
Vaccinated: > or =11.5 mIU/mL
A positive result indicates recovery from acute or chronic hepatitis B virus (HBV) infection or acquired immunity from HBV vaccination. This assay does not differentiate between a vaccine-induced immune response and an immune response induced by HBV. A positive hepatitis B core (anti-HBc) total antibody result would indicate that the hepatitis B surface antibody (anti-HBs) response is due to past HBV infection.
Per assay manufacturer's instructions for use, positive results, defined as anti-HBs levels of 11.5 mIU/mL or greater, indicate adequate immunity to HBV from past hepatitis B or HBV vaccination. However, per current Centers for Disease Control and Prevention guidance,(1) individuals with anti-HBs levels greater than 10 mIU/mL after completing an HBV vaccination series are considered protected from hepatitis B infection.
Negative results, defined as anti-HBs levels of less than 8.5 mIU/mL, indicate a lack of recovery from acute or chronic hepatitis B or inadequate immune response to HBV vaccination. The US Advisory Committee on Immunization Practices does not recommend more than 2 HBV vaccine series in vaccine nonresponders.
Indeterminate results, defined as anti-HBs levels in the range from 8.5 to less than 11.5 mIU/mL, indicate inability to determine if anti-HBs is present at levels consistent with recovery or immunity. Repeat testing is recommended in 1 to 2 months to determine definitive anti-HBs status.
For more information see Hepatitis B: Testing Algorithm for Screening, Diagnosis, and Management.
This assay has not been licensed by the US Food and Drug Administration for the screening of blood, plasma, and tissue donors.
For diagnostic purposes, the results should always be assessed in conjunction with the patient’s medical history, clinical examination, and other findings.
Assay performance characteristics have not been established for the use of the Elecsys Anti-HBs (hepatitis B surface antibody) assay as an aid in determining susceptibility to hepatitis B virus infection prior to or following vaccination in infants, children, or adolescents.
A positive anti-HBs result does not exclude infection by another hepatitis virus. Individuals who have received blood component therapies (eg, whole blood, plasma, or intravenous immunoglobulin infusion) in the previous 3 to 6 months may have false-positive anti-HBs results due to passive transfer of anti-HBs present in these products. In rare cases, interference due to high titers of antibodies to immunological components, streptavidin or ruthenium can occur, causing false-positive anti-HBs results.
Serum specimens from individuals taking biotin supplements of 20 mg or more per day may have false-negative HBs Ab test results due to interference of biotin with the assay. Such individuals should stop taking these biotin-containing dietary supplements for a minimum of 12 hours before blood collection for this test.
Anti-HBs levels from past hepatitis B or hepatitis B virus vaccination may fall below detectable levels over time. Negative anti-HBs test results from immunosuppressed individuals should be interpreted with caution.
Results obtained with the Elecsys Anti-HBs immunoassay may not be used interchangeably with values obtained with different manufacturers’ assay methods.
Performance characteristics have not been established for the following specimen characteristics or specimen types:
-Grossly icteric (total bilirubin level of >30 mg/dL)
-Grossly lipemic (intralipid level of >1500 mg/dL)
-Grossly hemolyzed (hemoglobin level of >1600 mg/dL)
-Containing particulate matter
-Heat-inactivated specimens
-Cadaveric specimens
-Specimen types other than serum
1. Advisory Committee on Immunization Practices; Centers for Disease Control and Prevention: Immunization of health-care personnel: recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR Recomm Rep. 2011 Nov 25;60(RR-7):1-45
2. LeFevre ML. Screening for hepatitis B virus infection in nonpregnant adolescents and adults: U.S. Preventive Services Task Force recommendation statement. Ann Intern Med. 2014;161(1):58-66. doi:10.7326/M14-1018
3. Jackson K, Locarnini S, Gish R. Diagnostics of hepatitis B virus: Standard of care and investigational. Clin Liver Dis. 2018; 12(1):5-11. doi:10.1002/cld.729
4. Coffin CS, Zhou K, Terrault NA. New and old biomarkers for diagnosis and management of chronic hepatitis B virus infection. Gastroenterology. 2019;156(2):355-368. doi:10.1053/j.gastro.2018.11.037
5. WHO guidelines on hepatitis B and C testing. Geneva: World Health Organization; February 2017. Accessed December 21, 2023. Available at www.who.int/publications/i/item/9789241549981
6. Conners EE, Panagiotakopoulos L, Hofmeister MG, et al. Screening and Testing for Hepatitis B Virus Infection: CDC Recommendations - United States, 2023. MMWR Recomm Rep. 2023;72(1):1-25. doi:10.15585/mmwr.rr7201a1
The Elecsys Anti-HBs (hepatitis B virus surface antibody) assay is based on the sandwich immunoassay principle and performed using an electrochemiluminescent immunoassay on the automated cobas e 801 immunochemistry analyzer. Anti-HBs present in patient's serum sample reacts with the biotinylated HBs antigen (ad and ay subtypes) and HBs antigen (ad/ay) labeled with a ruthenium complex to form a sandwich complex. After the addition of streptavidin-coated microparticles (solid phase), the complexes bind to the solid phase via interaction of biotin and streptavidin. The reaction mixture is aspirated into the measuring cell where microparticles are magnetically captured onto the surface of the electrode. Unbound substances are then washed away, and voltage is applied to the electrode, which induces chemiluminescent emissions that is measured by a photomultiplier. The emission signal generated is directly proportional to the concentration of anti-HBs present in the patient's sample. (Package insert: Elecsys Anti-HBs. Roche Diagnostics; v3.0, 03/2024)
Monday through Saturday
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.
86706
| Test Id | Test Order Name | Order LOINC Value |
|---|---|---|
| HBAB | HBs Antibody, S | 5193-8 |
| Result Id | Test Result Name |
Result LOINC Value
Applies only to results expressed in units of measure originally reported by the performing laboratory. These values do not apply to results that are converted to other units of measure.
|
|---|---|---|
| HB_AB | HBs Antibody, S | 10900-9 |
| HBSQN | HBs Antibody, Quantitative, S | 5193-8 |