Hepatitis B Surface Antibodies (HBsAb) Quantitative

The Hepatitis B Surface Antibody (HBsAb) test measures the level of antibodies produced in response to the Hepatitis B surface antigen (HBsAg). This test can be quantitative, meaning it measures the actual amount of antibody present in the blood.

• HBsAb is typically present after recovery from Hepatitis B infection or after vaccination against the virus.

Why consider this test?

• Detecting immunity: The test is used to determine whether an individual has immunity to Hepatitis B, either from a previous infection or from vaccination.
• Monitoring vaccination response: It helps assess the effectiveness of the Hepatitis B vaccine.
• Assessing recovery from infection: After an individual recovers from Hepatitis B, the presence of HBsAb indicates immunity and recovery.

Who should get this test done?

• Individuals who have received the Hepatitis B vaccine to check if they have developed sufficient immunity.
• People recovering from Hepatitis B infection to assess if they have cleared the virus.
• People with Hepatitis B exposure or at risk of infection who need to confirm their immunity status.

More Information

A positive result for HBsAb means the person is immune to Hepatitis B, either due to previous infection or vaccination. Negative results may indicate no prior exposure or immunity.