Measurement of surface antigen and antibodies of the hepatitis B virus in a blood sample; distinguishes acute, chronic, past infection and vaccine-induced immunity.
Indication
- Complaints of jaundice, fatigue, loss of appetite, abdominal pain, or nausea
- Detection of elevated liver enzymes (ALT, AST)
- History of close contact with hepatitis B carriers or patients
- Screening prior to blood transfusion, surgery, or pregnancy
- Immunity check after hepatitis B vaccination (Anti-HBs)
- Healthcare worker, hemodialysis patient, or history of intravenous drug use
- Follow-up of a known hepatitis B patient and assessment of treatment response
Preparation
- No special fasting required; sample can be drawn at any time
- Regular medications can be taken normally
- Vaccination history and previous test results should be reported to the laboratory
How it's performed
- The patient is prepared in a sitting or reclined position
- A 5-10 mL blood sample is generally drawn from an arm vein
- The blood sample is placed into sterile tubes and sent to the laboratory
- HBsAg, Anti-HBs, Anti-HBc, and HBeAg are measured by automated immunoassay (ELISA/CMIA)
- Results are usually reported the same day or within 24 hours
Post-procedure
- If HBsAg is positive, acute/chronic distinction is made with Anti-HBc IgM, HBeAg, HBV DNA, and liver enzymes
- If Anti-HBs is positive and HBsAg is negative, this is interpreted as vaccine-induced immunity or past infection
- If all values are negative, vaccination is recommended
- In chronic hepatitis B, HBV DNA and liver follow-up are scheduled every 3-6 months
Risks
- Transient pain, bruising, or hematoma at the blood draw site
- Rarely fainting (vasovagal reaction)
- Local infection at the needle insertion site (very rare)
- False positive or negative results (rare; confirmatory tests are performed)
FAQ
Do I need to fast for the hepatitis B test?
No, fasting is not required. The test can be performed at any time of day.
What does it mean if HBsAg is positive?
It indicates that the hepatitis B virus is present in your body. Additional tests (Anti-HBc IgM, HBV DNA, liver enzymes) are performed to determine whether the infection is acute or chronic.
I was vaccinated; why was Anti-HBs ordered?
It is measured to see whether the body produced sufficient protective antibodies (Anti-HBs ≥10 mIU/mL) after vaccination.
How long does it take to get the results?
In most laboratories, results are provided the same day or within 24 hours.
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