Hepatitis B Surface Antigen (HBsAg) Test
Category
Liver
Specimen
Blood
Organ System
Liver
Available At
0 labs
About Hepatitis B Surface Antigen (HBsAg) Test
HBsAg, or Hepatitis B Surface Antigen, is a protein found on the surface of the Hepatitis B virus, and its presence in your blood is the earliest and most direct marker that the virus is actively present in your body.
A positive HBsAg result appears well before symptoms typically develop, which is what makes this test so valuable for early detection, screening, and preventing further transmission.
If HBsAg remains detectable for more than six months, it indicates the infection has become chronic rather than resolving on its own, a distinction that significantly changes long-term monitoring and treatment approach.
Because Hepatitis B can be transmitted through blood, from mother to child during birth, and through sexual contact, HBsAg screening is a standard part of prenatal care, blood donation screening, and pre-surgical workups in many healthcare systems.
When Should You Get Hepatitis B Surface Antigen (HBsAg) Test
This test is recommended for:
- Routine screening before surgery or during pregnancy
- Unexplained elevation in liver enzymes on an LFT
- Known or suspected exposure to Hepatitis B
- Household or sexual contact with someone who has Hepatitis B
- Healthcare workers, as part of routine occupational screening
Conditions Hepatitis B Surface Antigen (HBsAg) Test Can Detect
This test helps identify:
- Acute Hepatitis B infection, when combined with other markers and symptoms
- Chronic Hepatitis B carrier status, if HBsAg remains positive beyond six months
- Ongoing risk of transmission to others
How to Prepare for Hepatitis B Surface Antigen (HBsAg) Test
- No fasting is required for this test.
- A standard venous blood sample is used.
- If your result is positive, your doctor will likely order additional tests to determine whether the infection is acute or chronic, and to assess liver health.
Hepatitis B Surface Antigen (HBsAg) Test Normal Reference Ranges
| Parameter | Normal Range |
|---|---|
| Result | Non-reactive (negative) or Reactive (positive) |
A positive result means the Hepatitis B virus is currently present in your blood — your doctor will use follow-up testing to determine whether this represents a new acute infection or an established chronic infection.
Health Conditions A–Z
LabDekho500+ Diseases & Conditions Explained
Understand symptoms, causes, treatment options and prevention for hundreds of conditions — written for patients, reviewed for accuracy.
No labs have listed a price for this test yet.
Check back soon, or browse every accredited lab on Lab Dekho.
Frequently Asked Questions About Hepatitis B Surface Antigen (HBsAg) Test
What does a positive HBsAg result mean?
It means the Hepatitis B virus is currently present and active in your blood. Your doctor will order follow-up tests to determine whether it's a new (acute) infection, which often clears on its own, or a long-standing (chronic) one requiring ongoing management.
Can Hepatitis B be prevented?
Yes, an effective and widely available vaccine provides strong protection against Hepatitis B infection and is recommended as part of routine childhood immunization in many countries, as well as for at-risk adults.
Is chronic Hepatitis B curable?
While a complete cure is uncommon, chronic Hepatitis B can be effectively managed with antiviral medications that suppress the virus and significantly reduce the risk of long-term liver damage.
Medical Disclaimer: This page is for informational purposes only and does not constitute medical advice. Lab test results should always be interpreted by a qualified healthcare professional in the context of your clinical history. Do not self-diagnose or alter your treatment based on test results alone.
Not priced near you yet
New partner labs are added regularly.