New Saliva Test for Endometriosis: What Emerging Diagnostic Tests Mean for Patients

Hepatitis B is a viral infection that affects the liver and can cause both acute and chronic disease. The virus is transmitted through contact with infected blood or other body fluids. Laboratory testing plays a crucial role in diagnosing hepatitis B infection, monitoring disease progression, and determining appropriate treatment strategies.

The primary laboratory tests for hepatitis B include several markers that detect different components of the virus or the body's immune response to it. The hepatitis B surface antigen (HBsAg) test is typically the first screening test performed, as it indicates active infection when positive. If HBsAg is detected, additional tests are needed to determine whether the infection is acute or chronic. The hepatitis B surface antibody (anti-HBs) test shows immunity either from previous infection or vaccination. The hepatitis B core antibody (anti-HBc) test helps distinguish between acute and chronic infection, with IgM anti-HBc indicating recent infection and IgG anti-HBc suggesting past or chronic infection.

For patients diagnosed with hepatitis B, additional laboratory tests help assess liver function and the extent of liver damage. These include liver enzyme tests such as alanine aminotransferase (ALT) and aspartate aminotransferase (AST), which become elevated when liver cells are damaged. Bilirubin levels, albumin, and prothrombin time are also measured to evaluate how well the liver is functioning. In chronic hepatitis B cases, viral load testing measures the amount of hepatitis B DNA in the blood, which helps doctors determine disease activity and monitor response to antiviral treatment.

Regular monitoring through laboratory tests is essential for people with chronic hepatitis B infection. Testing frequency depends on disease stage and whether the patient is receiving treatment. Those on antiviral therapy typically need viral load testing every three to six months to ensure the medication is working effectively. Liver function tests are performed periodically to detect any progression of liver damage. Some patients may also need additional tests such as alpha-fetoprotein to screen for liver cancer, a potential complication of chronic hepatitis B infection.