What it measures
- Hepatitis B surface antigen (HBsAg)
Who it’s for
- Possible exposure to hepatitis B
- Being born in, or having lived in, a country where hepatitis B is common
- Occupational or pre-procedure screening
- A partner or family member with hepatitis B
Who should test
Hepatitis B spreads through blood and sexual contact, and from mother to baby at birth. Many people with long-term infection caught it as children and feel completely well. Testing is recommended if you were born or lived in a country where hepatitis B is common, have had unprotected sex, have injected drugs, or have a partner or family member with hepatitis B.
If your result is positive
A positive HBsAg means the virus is present. Further tests show whether the infection is new or long-term and how active it is. Your GP can refer you to a liver specialist, and close contacts can be offered vaccination.
How to prepare
- Drink a couple of glasses of water beforehand: it makes the sample quicker and easier to take.
- No fasting needed. Eat and drink as normal.
How it works at our Croydon clinic
Book online
Choose your test and a time that suits you. No GP referral needed.
A 15-minute visit
A trained clinician takes a small blood sample at 169 Shirley Road, Croydon. Tell us if you’re nervous.
Results in 1–3 days
A clear report showing each result against its reference range.
Next steps
Share your report with your GP, who can arrange NHS follow-up if anything needs it.
Questions
When should I test after possible exposure?
HBsAg usually shows up within 4 to 6 weeks, and a negative result 12 weeks after exposure is reliable.
I’ve been vaccinated. Is this test still useful?
Yes. Vaccination doesn’t affect this test, so it’s still useful if you might have been infected before you were vaccinated.
How much is a Hepatitis B Test in Croydon?
£70 at our clinic at 169 Shirley Road, Croydon, including taking your blood sample and your report.
How quickly will I get my results?
Usually within 1 to 3 days, in a clear report showing each result against its reference range.