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Hepatitis B Surface Antigen Blood Test

Hepatitis B Surface Antigen Blood Test


A simple finger-prick blood test to check for a current infection of hepatitis B.
Blood sample 1 biomarker included Results estimated in 3 working days from sample receipt at lab
Hepatitis B Surface Antigen Blood Test
Hepatitis B Surface Antigen Blood Test
Hepatitis B Surface Antigen Blood Test
Hepatitis B Surface Antigen Blood Test
Hepatitis B Surface Antigen Blood Test

Is it for you?

Have you recently been exposed to blood or bodily fluids from another individual which may put you at risk of hepatitis B infection? Have you recently visited a country with a prevalence of hepatitis B and want to check whether you have become infected? Are you unsure whether you are protected through immunity to hepatitis B? If you think you may be at risk of a current hepatitis B infection, then this test is right for you.

What's included?

Biomarker profile

  • Infection

Infection (1 Biomarker)

Special instructions

If there is a chance that you have been exposed to HIV, hepatitis B or C then please let us know how long before taking your sample this occurred. Your sample should be taken 4 weeks after any hepatitis B exposure. Do not take biotin supplements for 2 days prior to this test. If you are taking prescribed biotin you should discuss this with your doctor.

From the expert

This test is for people who think they may have an active current infection of hepatitis B. It does not test for antibodies so will not tell you whether you have immunity to hepatitis B. 

Hepatitis B is an infection caused by the hepatitis B virus (HBV) which causes inflammation and enlargement of the liver. HBV infections can vary from a mild form that lasts a few weeks, to a more serious, chronic, form which can cause lasting liver damage. HBV is spread through contact with blood or other body fluids from an infected person. Exposure can occur through sharing needles or through unprotected sex. People who live in or travel to areas of the world where hepatitis B is prevalent are at greater risk. It is possible for pregnant women to pass the infection to their babies, usually during or after birth.

Hepatitis B Surface Antigen (HBsAg) can be detected in the blood on average around 4 weeks after exposure to HBV. The hepatitis B virus is a DNA virus consisting of a core particle and a surrounding envelope. The envelope of the virus contains the surface antigen (HBsAg). This test looks for the presence of HBsAg to identify a hepatitis infection.

Dr Sam Rodgers MBBS, MRCGP
Chief Medical Officer


Laboratories you can trust

Trusted by the NHS and private clinics alike, you can be sure of the highest testing standards from our UKAS accredited partner laboratories.

Dr Sam Rodgers - Chief Medical Officer

Expert advice with your results

Get trusted advice and comments from one of our doctors based on your results.

Your personal health centre

Your personal health centre

Discover the easy way to track your health through our online portal, View your results with doctor's advice, monitor any changes over time and see the improvements you can make to your health with simple lifestyle changes.

Questions? Let us help
Questions? Let us help

Questions? Let us help

Our customer care team is on-hand to help you find the test that's right for you. Get in touch via phone, live chat or email.


Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.