Hepatitis B virus (HBV) testing is important for detecting, classifying, and managing HBV disease.
HBV serologic marker results may be identified either qualitatively or quantitatively as foreign units (IU) or signal per cutoff (s/c) values. A hepatitis B surface antigen (HBsAg) level of less than 1 s/c, for example, is considered negative, while a level of more than 5 s/c is considered positive.