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  • HBsAg(B型肝炎の表面抗原)
  • HBsAb または抗HBs(B型肝炎の表面抗体)
  • HBcAb または抗HBc(B型肝炎のコア抗体)







Hepatitis B Blood Tests

Is there a blood test for hepatitis B?

There is a simple hepatitis B blood test that your doctor or health clinic can order called the “hepatitis B blood panel”. This blood sample can be taken in the doctor’s office.

There are 3 common tests that make up this blood panel. Sometimes the doctor may ask to check your blood again six months after your first visit to confirm your hepatitis B status. If you think you have been recently infected with hepatitis B, it can take up to 9 weeks before the virus will be detected in your blood.

Understanding your hepatitis B blood test results can be confusing, so you want to be sure about your diagnosis – are you infected with hepatitis B, have you recovered from a hepatitis B infection, or do you have a chronic hepatitis B infection?

In addition, it is helpful if you request a written copy of your blood tests so that you fully understand which tests are positive or negative.

What three tests make up the "hepatitis B blood panel"?

The hepatitis B blood panel requires only one blood sample but includes three tests that are needed to make a final diagnosis:

  • HBsAg (hepatitis B surface antigen)
  • HBsAb or anti-HBs (hepatitis B surface antibody)
  • HBcAb or anti-HBc (hepatitis B core antibody)

What is the hepatitis B surface antigen (HBsAg)? 

A "positive" or “reactive” HBsAg test result means that the person is infected with the hepatitis B virus, which can be an "acute" or a "chronic" infection. Infected people can pass the virus on to others through their blood.

What is the hepatitis B surface antibody (HBsAb or anti-HBs)?

A "positive" or “reactive” HBsAb (or anti-HBs) test result indicates that a person has either successfully responded to the hepatitis B vaccine or has recovered from an acute hepatitis B infection. This result (along with a negative HbsAg result) means that you are immune to (protected from) a future hepatitis B infection.

What is the hepatitis B core antibody (HBcAb)?

The HBcAb is an antibody that is part of the virus- it does not provide protection. A "positive" or "reactive" HBcAb (or anti-HBc) test result indicates a past or present infection. The interpretation of this test result depends on the results of the other two tests. Its appearance with the protective surface antibody (positive HBsAb or anti-HBs) indicates prior infection and recovery. For chronically infected persons, it will usually appear with the virus (positive HBsAg).