If the test in the hospital is negative for hepatitis B surface antigen and positive for hepatitis B surface antibody, this result means that it is normal and not contagious, the reason for such a result may be that you have received hepatitis B vaccine in the past, or you may have been infected by patients with hepatitis B, but you have cleared it yourself and produced protective antibodies, i.e., hepatitis B surface antibody. What needs to be further clarified is the quantitative amount of Hepatitis B surface antibody, if the quantitative amount is above 100mIU/ml, it is very strong protective significance. If the amount is below 10mIU/ml, what needs to be done is to go through three injections of hepatitis B vaccine again, and after the vaccination, the quantitative amount of hepatitis B surface antibody should be tested again, and if it is above 100mIU/ml, it can avoid being infected by hepatitis B patients.