The accuracy of HIV test strips cannot reach 100%, so they are not completely accurate, but have some reference value. The accuracy is mainly due to the limitations of the rapid test method and the accuracy of personal operation. HIV test strips are made based on the principle of immunoassay by the double antigen sandwich method, and they can be mainly divided into three kinds of test strips: saliva test, blood test and urine test. Generally speaking, the accuracy of HIV test strips that meet the production standards can reach 95%-99%. the main error of HIV test strips is due to operational problems, so the correct use of HIV test strips in testing can follow the following steps: 1. buy suitable HIV test strips: it is best to use experimental test strips or gold standard test strips, testers can choose different kinds of test strips according to the actual situation; 2. pay attention to the method of use : Take care not to contaminate the test paper or sample during blood, saliva, urine collection, pay attention to hygiene issues during blood collection to avoid viral or bacterial infection, after collecting the sample, tear the protective layer of the test paper, drop in the buffer and then contact with the test paper, and finally observe the results. Since the accuracy of HIV test strips cannot reach 100%, it is recommended that men or women with HIV symptoms or confirmed risk of HIV infection can go to a regular hospital for detailed HIV examination and treatment after a clear diagnosis, and not to avoid treatment because HIV involves privacy issues and delays the condition.