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HBsAg

Hepatitis B Surface Antigen Test (HBsAg)

 

Hepatitis B surface antigen (HBsAg) is a blood test ordered to determine if someone is infected with the hepatitis B virus. If it is found, along with specific antibodies, it means the person has a hepatitis B infection. If your blood is positive for HBsAg, it means you are infectious for the virus and can pass it to other people through your blood or body fluids.

 

Hepatitis B

Hepatitis B is a serious liver infection caused by the hepatitis B virus (HBV). For some people, hepatitis B infection becomes chronic, meaning it lasts more than six months. Having chronic hepatitis B increases your risk of developing liver failure, liver cancer or cirrhosis—a condition that causes permanent scarring of the liver.

Most people infected with hepatitis B as adults recover fully, even if their signs and symptoms are severe. Infants and children are more likely to develop a chronic hepatitis B infection. A vaccine can prevent hepatitis B, but there’s no cure if you have it. If you’re infected, taking certain precautions can help prevent spreading HBV to others.

 

Symptoms

Signs and symptoms of hepatitis B, ranging from mild to severe, usually appear about one to four months after you’ve been infected. They may include:

  • Abdominal pain
  • Dark urine
  • Fever
  • Joint pain
  • Loss of appetite
  • Nausea and vomiting
  • Weakness and fatigue
  • Yellowing of your skin and the whites of your eyes (jaundice)

 

Causes

The Hepatitis B virus is passed from person to person through blood, semen or other body fluids.

Common ways HBV is transmitted include:

  • Sexual contact. You may become infected if you have unprotected sex with an infected partner whose blood, saliva, semen, or vaginal secretions enter your body.
  • Sharing of needles. HBV is easily transmitted through needles and syringes contaminated with infected blood. Sharing intravenous (IV) drug paraphernalia puts you at high risk of hepatitis B.
  • Accidental needle sticks. Hepatitis B is a concern for health care workers and anyone else who comes in contact with human blood.
  • Mother to child. Pregnant women infected with HBV can pass the virus to their babies during childbirth. However, the newborn can be vaccinated to avoid getting infected in almost all cases. Talk to your doctor about being tested for hepatitis B if you are pregnant or want to become pregnant
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