Hepatitis B is a serious viral infection that affects the liver. The hepatitis B virus (HBV) is spread through contact with the blood or other body fluids of an infected person.

Most people with hepatitis B have no symptoms and do not know they are infected. However, HBV can cause chronic liver disease, including cirrhosis and liver cancer.

Acute Hepatitis B Virus:

Acute hepatitis B infection is a serious viral infection that can cause liver damage. Your doctor may recommend the HBsAg test if you have symptoms of acute hepatitis B, such as fatigue, fever, abdominal pain, dark urine, or yellowing of your skin or eyes (jaundice). You may also be tested for HBsAg if you have been exposed to the virus, such as through unprotected sex or sharing needles.

Chronic Hepatitis B Virus:

Chronic hepatitis B infection is a serious disease that can lead to liver failure, liver cancer, and death. The hepatitis B surface antigen (HBsAg) test is used to detect the presence of the HBsAg protein on the surface of the hepatitis B virus. This protein is produced by the virus and is used to infect healthy cells. If the HBsAg test is positive, it means that you have a chronic hepatitis B infection and require treatment.