Hepatitis B two-to-one is a serological marker of hepatitis B virus to check whether the human body is infected with the hepatitis B virus. The tests generally taken by hospitals are qualitative, i.e. whether the hepatitis B two-to-one index is negative or positive, positive means that it is detected in the blood and negative means that it is not detected in the blood. For example, a positive hepatitis B surface antigen indicates infection with the hepatitis B virus, while a positive hepatitis B surface antibody indicates the presence of protective antibodies in the body. The hepatitis B two-to-one qualitative test plays a role in the diagnosis of hepatitis B disease, monitoring of the disease, and observation of the efficacy of treatment. However, with the development of clinical medicine, the qualitative hepatitis B two-to-one test is far from satisfying clinical and patient requirements, especially in the observation of efficacy and the observation of antibody production after hepatitis B vaccination. With the development of laboratory medicine, the quantitative hepatitis B two-to-one assay has become feasible, which has greatly compensated for the shortage of qualitative hepatitis B two-to-one assay. Moreover, the quantitative hepatitis B two-to-one assay can be complemented with HBVDNA fluorometric assay to comprehensively evaluate the patient’s condition and drug efficacy, which is widely used in current clinical treatment. Specifically, what is the role of the hepatitis B two-to-one test? The hepatitis B 2:30 quantitative test can evaluate and predict the efficacy of hepatitis B. The hepatitis B 2:30 quantitative test can provide precise levels of hepatitis B viral markers. This is not only a methodological advancement, but also has a greater superiority in clinical use. Clinical use has shown that the level of the hepatitis B two-to-one quantitative test is a reliable basis for the diagnosis of hepatitis B. Data show that increased serum hepatitis B viraemia levels trigger the body’s immune response and as a result lead to liver damage, manifested by elevated transaminases (ALT). The detection of hepatitis B virus level not only can better reflect the viral serum level and the strength of infection in hepatitis B virus carriers, but also has important significance in dynamically observing the change of hepatitis B virus level before and after treatment as well as evaluating and predicting the efficacy. Therefore, changes in the quantitative hepatitis B two-to-one test are important for both evaluating and predicting the efficacy of treatment, and are effective indicators for efficacy observation. If the concentration of HBsAg and HBeAg decreases, it means that the disease is improving and the treatment is effective, especially if the concentration of HBeAg decreases until it disappears, it is the best reflection of the treatment effect. If the concentration of HBsAg and HBeAg increases instead of decreasing during the treatment process, it means that the treatment is ineffective or inefficient, and a change in the treatment plan should be considered, otherwise the treatment will be delayed and the patient will be disadvantaged. After hepatitis B vaccination, the body produces reactive antibodies, and the degree of antibody production can be known by quantitatively measuring the concentration of anti-HBs, while a high concentration of anti-HBs indicates successful vaccination. After a certain period of vaccination, the concentration of antibodies will gradually decrease. At this time, quantitative testing of anti-HBs will be performed, and if the concentration is low, a booster vaccination is needed to ensure that the body maintains an effective immune status. Hepatitis B two-and-a-half quantitative test can reduce the misdiagnosis rate Hepatitis B two-and-a-half quantitative test is more sensitive than qualitative test, when the hepatitis B viral marker is at low concentration, the qualitative test can be negative, but the quantitative test can still detect it, which to a certain extent reduces the leakage rate and avoids misdiagnosis, which fully reflects the superiority of hepatitis B two-and-a-half quantitative test. Hepatitis B two pairs of half quantitative test precautions In the hepatitis B two pairs of half quantitative test, pay attention to choose large liver disease specialist hospital, they generally have advanced testing equipment, can reduce the error in the test, improve the accuracy of the test, for hepatitis B diagnosis and treatment to provide a scientific basis. This also avoids the additional economic and mental burden of misdiagnosis and mistreatment.