Hepatitis B Testing

The Fettle self-sampling kit

The test for Hepatitis B is a blood sample, collected from a finger prick.

You can watch the blood test instruction video or follow this link to see the instruction leaflet that comes with the kit.

It is best to wait 4 weeks after potential exposure to take a Hepatitis B test, but in some cases it can take up to 6 months for the infection to show in results.

You can customise your own self-sample kit, and choose which of the 6 most common infections to test for.


You should seek immediate medical advice if you think you have been exposed to Hepatitis B. It is possible to prevent infection with treatment, but to be most effective it should be given in the first 48 hours after exposure.

Hepatitis B can be managed at home in the early stages, using over-the-counter painkillers such as paracetamol. You may be prescribed codeine if the pain is more severe.

If you have chronic Hepatitis B, you will be symptom-free for much of the time. However, you may need to take medication to prevent liver damage and have regular tests done. There are now very effective medications that can suppress the virus over many years.

Telling your partner

If you are diagnosed with Hepatitis B you should tell anyone who you may have had blood to blood contact with, or unprotected sex with, since you became infected. In some cases this may be hard to work out, so it is best to discuss the risks to others with a clinician. Any contacts may have the virus without knowing it, so it is important for them to get tested.

How is it passed on?

  • it is usually transmitted through blood to blood contact, for example, sharing needles when injecting drugs, a cut in the skin that comes into contact with infected blood, use of unsterilised equipment when getting a tattoo/body piercing, sharing razors or toothbrushes that are contaminated with infected blood or other bodily fluids

  • it can be transmitted through sex, although this is rare and can be prevented by using a condom. However, it is 50 – 100 times more infectious than HIV.

How to avoid Hepatitis B?

  • never share any drug-injecting equipment with other people (not just needles, but also syringes, spoons and filters)

  • don’t get tattoos or piercings from unlicensed places

  • don’t share razors, toothbrushes or towels that might be contaminated with blood or other bodily fluids

  • use a condom, especially with a new partner, for anal and oral sex. You can order male and female condoms here

  • Hepatitis B vaccine is available from the NHS, and is recommended for people who are at risk of infection. This includes people who inject drugs, sex workers, men who have sex with men, and people whose partners or close family have the virus.

Symptoms and long term effects

Most people clear the virus after this initial stage and are then immune to the infection. These people will not be infectious. You can only be certain you have hepatitis if you have a test.

Short term

During the early stage of infection there may not be any symptoms. If symptoms do develop, this is usually within the first six months after infection and they can be easily mistaken for another condition. Those who do get symptoms may experience:
Flu-like symptoms, such as muscle aches and loss of appetite, high temperature, feeling tired all the time, depression, loss of appetite and weight loss, sickness and diarrhoea. One in five will experience yellowing of the eyes and skin (jaundice).

Long term

Some people’s bodies cannot clear the virus and so they will develop a long term infection called chronic hepatitis. Hepatitis B can lead to problems with your liver, including scarring of the liver (cirrhosis), often years after catching the infection.


It is best to wait 4 weeks after potential exposure to take a Hepatitis B test, but in some cases it can take up to 6 months for the infection to show in results.

Your GP, a sexual health clinic or occupational health department (if your occupation puts you at risk of infection). Follow this link to find your nearest sexual health clinic.

Side effects are rare, but contact the person who gave you the vaccine at once if you have a serious side effect such as:

  • fever, sore throat, and headache with a severe blistering, peeling, and red skin rash
  • irritability
  • fast or pounding heartbeats
  • easy bruising or bleeding.

Less serious side effects include:

  • redness, pain, swelling, or a lump where the injection was given
  • headache, dizziness
  • low fever
  • joint pain, body aches
  • tired feeling
  • nausea, vomiting, stomach pain, constipation, diarrhoea.

No, you will need to check your levels of immunity some years after vaccination. The health care professional who gives you the vaccine will advise you when your immunity levels need checking.

Antiviral medication usually acts to prevent a virus from multiplying.

No, not in men or women.

They will be able to tell if you have symptoms of infection but not if you don’t. However, it is important that you tell your partner since you may pass or have passed the infection to them.