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HelpTest Code HEPBE Hepatitis B Virus e Antigen and Hepatitis B Virus e Antibody, Serum
Additional Codes
| Mayo Test ID |
|---|
| HEAG |
Reporting Name
Hepatitis Be Ag and Ab, SUseful For
Determining the presence or absence of detectable hepatitis B virus e antigen and antibody in monitoring infection status of individuals with chronic hepatitis B
Determining infectivity of hepatitis B virus (HBV) carriers
Monitoring serologic response of chronically HBV-infected patients receiving antiviral therapy
Profile Information
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| EAG | Hepatitis Be Ag, S | Yes | Yes |
| HEAB | HBe Antibody, S | Yes | Yes |
Method Name
Electrochemiluminescence Immunoassay (ECLIA)
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
Serum SSTOrdering Guidance
If ordered with HBVQN / Hepatitis B Virus (HBV) DNA Detection and Quantification by Real-Time PCR, Serum; send separate vials.
Additional Testing Requirements
Necessary Information
Date of collection is required
Specimen 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 (red-top tubes are not acceptable)
Submission Container/Tube: Plastic vial
Specimen Volume: 0.8 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.
Specimen Minimum Volume
0.7 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum SST | Frozen (preferred) | 90 days | |
| Refrigerated | 6 days | ||
| Ambient | 72 hours |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | Reject |
Special Instructions
Reference Values
HEPATITIS Be ANTIGEN:
Negative
HEPATITIS Be ANTIBODY:
Negative
For more information see Viral Hepatitis Serologic Profiles.
Day(s) Performed
Monday through Saturday
CPT Code Information
86707
87350
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| HEAG | Hepatitis Be Ag and Ab, S | 77176-6 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| EAG | Hepatitis Be Ag, S | 13954-3 |
| HEAB | HBe Antibody, S | 33463-1 |
Clinical Information
Hepatitis B virus (HBV) e antigen (HBeAg) is a small polypeptide, which exists in a free form in the serum of individuals during the early phase of hepatitis B infection, soon after hepatitis B virus surface antigen (HBsAg) becomes detectable. Serum levels of both HBeAg and HBsAg rise rapidly during the period of viral replication. The presence of HBeAg in serum correlates with viral infectivity, the number of infectious virions, and the presence of HBV core antigen in the infected hepatocytes.
During recovery from acute hepatitis B, HBeAg level declines and becomes undetectable in the serum, while HBe antibody (anti-HBe) appears and becomes detectable in the serum. Anti-HBe usually remains detectable for many years after recovery from acute HBV infection.
In HBV carriers and patients with chronic hepatitis B, positive HBeAg results usually indicate presence of active HBV replication and high infectivity. A negative HBeAg result indicates very minimal or no HBV replication. Positive anti-HBe test results usually indicate inactivity of the virus and low infectivity, and such positive results in the presence of detectable HBV DNA in serum also indicate active viral replication in these patients.
Interpretation
Presence of hepatitis B virus e antigen (HBeAg) and absence of HBe antibody (anti-HBe) usually indicate active hepatitis B virus (HBV) replication and high infectivity.
Absence of HBeAg with appearance of anti-HBe is consistent with loss of HBV infectivity.
Although resolution of chronic HBV infection generally follows the appearance of anti-HBe, the HBV carrier state may persist.
Cautions
Serum specimens from individuals taking multivitamins containing biotin or biotin supplements of 20 mg or more per day may have false-negative hepatitis B virus e antigen (HBeAg) and false-positive HBe antibody (anti-HBe) 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.
Disappearance of HBeAg or appearance of anti-HBe in serum does not completely rule-out chronic hepatitis B virus carrier state or infectivity.
Performance characteristics of these 2 assays have not been established in patients younger than 2 years, pregnant women, or in populations of immunocompromised or immunosuppressed patients. These 2 assays are not licensed by US Food and Drug Administration for testing cord blood samples or screening donors of blood, plasma, human cell, or tissue products.
Performance characteristics have not been established for the following specimen characteristics:
-Grossly icteric (total bilirubin level of >25 mg/dL)
-Grossly lipemic (Intralipid level of >1000 mg/dL)
-Grossly hemolyzed (hemoglobin level of >2000 mg/dL)
-Specimen containing particulate matter
Method Description
Hepatitis B Virus e Antigen:
The Elecsys HBeAg (hepatitis B e antigen) assay is based on the sandwich principle and performed using an electrochemiluminescence immunoassay on the automated cobas e 801 immunochemistry analyzer. HBeAg present in patient's sample reacts with 2 biotinylated monoclonal anti-HBeAg antibodies and a mixture of monoclonal anti-HBeAg antibody and polyclonal anti-HBeAg antibodies labeled with a ruthenium complex react to form a sandwich complex. After addition of streptavidin-coated microparticles (solid phase), the complexes bind to this solid phase via interaction of biotin and streptavidin. The reaction mixture is aspirated into the measuring cell where the microparticles are magnetically captured onto the surface of the electrode. Unbound substances are then washed away, and voltage is applied to the electrode that induces chemiluminescent emissions, which are measured by a photomultiplier. The test result is determined by comparing the electrochemiluminescence signal generated from the patient's sample to the cutoff index (COI) value set from reagent lot-specific assay calibration.(Package insert: Elecsys HBeAg. Roche Diagnostics, v1.0, 10/2020)
Hepatitis B Virus e Antibody:
The Elecsys Anti-HBe (hepatitis B virus e antibody) assay is based on the competitive immunoassay principle and performed using an electrochemiluminescence method on the automated cobas e 801 immunochemistry analyzer. Anti-HBe present in the patient's sample first binds to the added synthetic HBeAg. The remaining unbound sites on the synthetic HBeAg become occupied with the added biotinylated antibodies and ruthenium complex-labeled antibodies specific for HBeAg. The entire complex becomes bound to the streptavidin-coated microparticles (solid phase) via interaction of biotin and streptavidin. The reaction mixture is then aspirated into the measuring cell where the microparticles are magnetically captured onto the surface of the electrode. Unbound substances are then washed away, and voltage is applied to the electrode that induces chemiluminescent emissions, which are measured by a photomultiplier. Test result is determined by comparing the electrochemiluminescence signal generated from the sample to the COI value set from reagent lot-specific assay calibration.(Elecsys Anti-HBe. Roche Diagnostics; v1.0, 12/2021)