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- HBsAg
- Hepatitis
Special Instructions
This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.
Expected Turnaround Time
1 - 2 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Related Documents
Specimen Requirements
Specimen
Serum or EDTA plasma
Volume
3.5 mL
Minimum Volume
1.5 mL (Note: This volume does not allow for repeat testing.)
Container
Gel-barrier tube, red top tube or lavender-top (EDTA) tube
Collection
If tube other than a gel-barrier tube is used, transfer separated serum or plasma to a plastic transport tube.
Storage Instructions
Room temperature
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 14 days |
Refrigerated | 14 days |
Frozen | 14 days |
Freeze/thaw cycles | Stable x3 |
Causes for Rejection
Non-EDTA plasma specimen; PST gel-barrier tube
Test Details
Use
Screening of pregnant women for hepatitis B virus (HBV) infection to identify neonates who are at risk of acquiring hepatitis B during the perinatal period.
Limitations
Patients who are negative for HBsAg may still have acute hepatitis B infection. A nonreactive/negative result in individuals with prior exposure to hepatitis B may be due to antigen levels below the detection limit of the assay or lack of antigen reactivity to the antibodies in the assay used. In cases with strong clinical suspicion of viral hepatitis, testing should not be limited to detecting HBsAg, but should include a battery of tests to evaluate different stages of acute and convalescent hepatitis, including detection of antibodies to hepatitis B core antigen (anti-HBc) and HBV DNA.
Methodology
Immunochemiluminometric assay (ICMA)
Additional Information
Hepatitis B surface antigen (HBsAg) is a distinctive serological marker of acute or chronic hepatitis B infection. HBsAg is the first antigen to appear following infection with HBV and is generally detected 1-10 weeks after the onset of clinical symptoms. HBsAg assays are routinely used to diagnose suspected HBV infection and monitor the status of infected individuals to determine whether the infection has resolved or the patient has become a chronic carrier of the virus. In patients that recover from HBV infection, HBsAg is undetectable 3-5 months after the onset of infection. In patients with chronic HBV infection, HBsAg remains detectable for life. Prenatal HBsAg screening has been recommended so that newborns from HBV carrier mothers may obtain prophylactic treatment.
Refer to https://www.cdc.gov/hepatitis/hbv/pdfs/PrenatalHBsAgTesting.pdf for additional information on HBV testing recommendations in pregnant women.
References
Abara WE, Oaseem A, Schillie S. McMahon BJ, Harris AM, High Value Care Task Force of the American College of Physicians and the Centers for Disease Control and Prevention. Hepatitis B Vaccination, Screening, and Linkage to Care: Best Practice Advice from the American College of Physicians and the Centers for Disease Control and Prevention. Ann Intern Med. 2017 Dec 5;167(11):794-804.29159414
Centers for Disease Control and Prevention. Hepatitis B. CDC web site: www.cdc.gov/hepatitis/hbv/index.htm. Accessed May 2021.
Centers for Disease Control and Prevention; The American Colllege of Obstetrics and Gynecologists. Screening Pregnant Women for Hepatitis B Virus (HBV) Infection and Screening and Referral Algorithm for Hepatitis B Virus (HBV) Infection Among Pregnant Women. CDC web site: https://www.cdc.gov/hepatitis/hbv/pdfs/PrenatalHBsAgTesting.pdf. Accessed June 2021.
Schillie S, Vellozzi C, Reingold A, et al. Prevention of Hepatitis B Virus Infection in the United States. Recommendations of the Advisory Committee on Immunization Practices. MMWR Recomm Rep. 2018 Jan 12;67(1):1-31.29939980
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 144510 | HBV Prenatal Screen | 006510 | HBsAg Screen | 5196-1 |
| Reflex Table for HBsAg Screen | ||||||
|---|---|---|---|---|---|---|
| Order Code | Order Name | Result Code | Result Name | UofM | Result LOINC | |
| Reflex 1 | 016105 | HBsAg Confirmation | 016105 | HBsAg Confirmation | 7905-3 | |
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