Hepatitis B Virus DNA 2.00E+1 (IU/ml) is a quantitative test for the Hepatitis B virus, which represents the amount of Hepatitis B virus in the blood as 2 times 10 to the power of 1, or 20, and is generally considered negative. Hepatitis B virus is an enveloped DNA virus, and testing for Hepatitis B virus DNA can assess the timing of antiviral therapy for Hepatitis B and monitor response to antiviral therapy. Different tests have different low line levels for hepatitis B DNA. The low line for ordinary quantitative hepatitis B DNA test is 100IU/ml, the lower limit for high-sensitivity hepatitis B DNA load count is 20IU/ml, and the normal reference interval is 0-20IU/ml, so 20IU/ml of hepatitis B virus is considered that there is no detectable hepatitis B virus replication in the blood, and it can be combined with the hepatitis B markers and other conditions to determine whether hepatitis B infection. It is recommended that patients combine hepatitis B markers and other indicators to determine hepatitis B infection.