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Hepatitis B is a serious liver infection caused by the hepatitis B virus. This infection can range from a mild illness lasting a few weeks to a severe, lifelong condition. When someone first gets infected, it is called acute hepatitis B. If the virus remains in the body for more than six months, it becomes chronic hepatitis B, which can lead to serious health problems including liver damage, cirrhosis, liver cancer, and even liver failure.

Laboratory testing plays a crucial role in diagnosing hepatitis B and monitoring the infection. The most common initial test is the hepatitis B surface antigen test, which detects a protein on the surface of the virus. If this test is positive, it means the person is currently infected with hepatitis B. Additional blood tests can determine whether the infection is acute or chronic, and whether the person has developed immunity either from past infection or vaccination. These tests include hepatitis B surface antibody, hepatitis B core antibody, and hepatitis B e-antigen tests.

For people diagnosed with chronic hepatitis B, regular monitoring through laboratory tests is essential. Liver function tests measure enzymes and proteins in the blood that indicate how well the liver is working. Elevated levels of certain liver enzymes can signal liver inflammation or damage. The hepatitis B viral load test measures the amount of virus in the blood and helps doctors assess how active the infection is and whether antiviral treatment is needed. Regular testing also helps track the effectiveness of treatment and detect any changes in the infection status.

People at higher risk for hepatitis B infection should consider getting tested. This includes individuals born in countries where hepatitis B is common, people with HIV, injection drug users, men who have sex with men, healthcare workers exposed to blood, people on dialysis, and anyone living with someone who has hepatitis B. Pregnant women are routinely tested for hepatitis B because the virus can be passed to babies during childbirth. Early detection through laboratory testing allows for timely treatment and helps prevent transmission to others.