Hepatitis B virus dna 120 is not very contagious. Hepatitis B virus dna, also known as HBV-DNA, refers to the hepatitis B virus, and its normal value is less than 1,000. when tested, higher than this value means that the DNA of the hepatitis B virus is positive, and the presence of the hepatitis B virus in the body is highly infectious. Below this value, the test is negative and the hepatitis B virus is less contagious in the body. HBV-DNA belongs to the deoxyribonucleic acid of the hepatitis B virus, with high specificity and sensitivity, and is the most direct indicator of human papillomavirus infection.A positive HBV-DNA test indicates that the replication of the HBV virus is contagious, and the higher it is, the more the virus replicates and the more contagious it is. HBV-DNA as the gold standard to determine whether the hepatitis B virus is replicative, the normal value of different reagents will have some differences, so the test standard should be based on the reagents, methods, and machines used in the test. If there is any abnormality, you should go to the hospital in time for examination and treatment under the doctor’s guidance.