The normal value of Ultrasensitive HBV-DNA is less than 20 IU/mL, the exact value varies and different hospitals may have different standards. HBV-DNA testing, or hepatitis B virus DNA testing, can be categorized into ultrasensitive testing and normal testing. Ultra-sensitive test can control the normal value of HBV-DNA test below 20 IU/mL, once it is greater than 20 IU/mL, the test result is positive, which means the test subject is a hepatitis B patient or a hepatitis B carrier. However, Hepatitis B DNA test cannot be used to confirm the diagnosis of chronic hepatitis B. Liver function tests and tumor marker tests are also needed to make a clear diagnosis. In addition, chronic hepatitis B is very dangerous, once diagnosed, it is recommended to actively receive treatment under the guidance of a specialist, and at the same time, it is necessary to do a good job of preventive work to avoid infection of family members.