Hepatitis B Surface Antigen (HBsAg)
Know your hepatitis B status with one simple blood test.
What’s tested
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Hepatitis B Surface Antigen (HBsAg) testing is used to determine whether you are currently infected with the hepatitis B virus (HBV). The surface antigen is a protein that appears in the blood during an active infection, making it the earliest and most reliable marker of acute or chronic hepatitis B. This test is suitable for anyone who may have been exposed to the virus, including healthcare workers, people born in regions where hepatitis B is common, individuals with a history of injecting drug use, men who have sex with men, and anyone planning to start antiviral treatment or immunisation. It is also part of routine screening for blood donors, pregnant women, and patients before certain medical procedures.
What is being tested
- Hepatitis B surface antigen (HBsAg): A positive result indicates that the hepatitis B virus is present in your blood and you are capable of passing the infection to others. A negative result generally means you are not currently infected, although it does not confirm immunity from past infection or vaccination.
Why it matters
Identifying an active hepatitis B infection early allows you to access appropriate monitoring, treatment, and care to protect your liver and prevent transmission to others. It also helps guide decisions about vaccination, antiviral therapy, and lifestyle changes that can reduce the risk of long-term complications such as cirrhosis and liver cancer.
No special fasting required. Drink plenty of water prior to your appointment for a smooth blood draw.
- Identification: Photo ID (Passport or Driving Licence) is only required if you need your report for official, employment, visa/travel, premarital, or Identity-Verified Certificate (IVS) purposes (not required for personal health & wellness testing).
This test provides an official, quality-assured laboratory report with reference ranges. These results are for clinical information and do not replace your GP or consultant. Always discuss abnormal results with your GP or specialist in the context of your medical history.
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