HEPATITIS B SURFACE ANTIGEN (ELISA/CLIA)

The Hepatitis B Surface Antigen (HBsAg) Test (ELISA/CLIA) is a laboratory blood test used to detect the Hepatitis B Surface Antigen (HBsAg), a protein found on the surface of the Hepatitis B Virus (HBV). It is the primary screening test used to identify active hepatitis B infection, whether acute or chronic.

Hepatitis B is a viral infection that affects the liver and spreads through contact with infected blood, body fluids, contaminated needles, sexual contact, and from an infected mother to her baby during childbirth. While many adults recover completely from acute hepatitis B, some individuals develop chronic hepatitis B, which may lead to cirrhosis, liver failure, and hepatocellular carcinoma (liver cancer) if left untreated.

The presence of HBsAg in the blood usually indicates that the hepatitis B virus is present in the body. A positive HBsAg result suggests current HBV infection, but additional tests are required to determine whether the infection is acute or chronic, assess viral activity, and guide treatment.

Modern laboratories perform the HBsAg test using ELISA (Enzyme-Linked Immunosorbent Assay) or CLIA (Chemiluminescent Immunoassay) technologies. Both methods offer high sensitivity and specificity, making them reliable for hepatitis B screening, diagnosis, blood donor testing, prenatal screening, and routine health evaluations.

Doctors often recommend this test for individuals with symptoms of hepatitis, abnormal liver function tests, pregnant women, healthcare workers, blood donors, individuals at increased risk of HBV exposure, and those undergoing routine medical screening.

For a complete evaluation, the HBsAg Test is usually interpreted together with:

• Hepatitis B Surface Antibody (Anti-HBs)
• Total Hepatitis B Core Antibody (Total Anti-HBc)
• Anti-HBc IgM
• Hepatitis B e Antigen (HBeAg)
• Anti-HBe
• HBV DNA (PCR)
• Liver Function Tests (LFTs)

Together, these investigations provide a comprehensive assessment of hepatitis B infection, immunity, viral replication, and treatment response.

Benefits of the Test

• Detects active hepatitis B infection.
• Primary screening test for HBV.
• Helps identify acute and chronic hepatitis B.
• Suitable for blood donor and prenatal screening.
• Supports early diagnosis and timely treatment.
• Performed using highly sensitive ELISA or CLIA technology.
• Requires only a simple blood sample.
• Essential part of a comprehensive hepatitis B evaluation.

Why Doctors Recommend This Test

Doctors recommend the HBsAg Test to screen for hepatitis B infection, investigate abnormal liver function tests, evaluate patients with hepatitis symptoms, monitor individuals at high risk of HBV infection, and assess pregnant women to reduce the risk of mother-to-child transmission.

Preparation Before the Test

No special preparation is required.

You may eat and drink normally unless advised otherwise by your healthcare provider. Inform your doctor about previous hepatitis B infection, vaccination history, liver disease, medications, or recent exposure to HBV. A blood sample is collected from a vein for laboratory analysis.

Normal Reporting Time

Typically: 1–3 Working Days

Reporting time may vary depending on laboratory methodology.

Who Should Take This Test?

This test is recommended for:

• Individuals with suspected hepatitis B.
• Patients with abnormal liver function tests.
• Pregnant women.
• Blood donors.
• Healthcare workers.
• Individuals with occupational exposure to blood.
• Patients undergoing routine health screening.
• People with high-risk sexual exposure.
• Individuals sharing needles or injection equipment.
• Anyone advised by their healthcare provider.