Hepatitis B dna test results may come back in a day or a week or so. Hepatitis B dna test is a nucleic acid test for the hepatitis B virus, which is done by drawing blood from a vein and testing the dna value of the hepatitis B virus to determine the degree of viral replication. Hepatitis B dna test needs to amplify the dna molecules of the hepatitis B virus in the blood specimen, and only after amplifying them to a certain amount can the corresponding test results be found out. If the hepatitis B dna test is done on the same day, the result can be issued on the same day; if the hepatitis B dna test is done in the afternoon, the result can be issued on the second day; if the hospital is relatively small, the hepatitis B dna test can not be done immediately, and it may take about a week. Hepatitis B DNA results time, according to the local medical institutions, due to the large differences in the region, so the results of the time there are also large differences.