What is the significance of ultrasensitive surface antigen and how to evaluate the test results? 1. Ultrasensitive surface antigen can be as high as 100,000 iu/ml in infected patients with a high level of virus, reflecting the level of virus in the liver cells. Hepatitis patients in treatment every 3 months to reduce 1/3 to be considered effective; treatment effective patients with surface antigen below 1000iu/ml are not prone to relapse. 2 ultrasensitive surface antigen in the “small triple” hepatitis patients, the virus is higher than 5 times iu/ml, usually a few thousand iu/ml, reflecting the level of virus in the liver and the degree of disease; in the virus has been turned negative chronic carriers reduced to a few hundred to a few dozen iu/ml, in the not very far future can have the hope of drug discontinuation. 3.Ultrasensitive test is very sensitive, but very inaccurate. Increasing or decreasing a few hundred or even a few thousand units can be a permissible error, and decreasing by half a factor (0.5 log10) equivalent to one-third of the original is meaningful.