Sensitivity and specificity of candidate algorithms to identify acute hepatitis B.

ABBREVIATIONS: ICD9–International Classification of Disease, Ninth Revision, Clinical Modification; ALT–alanine aminotransferase; AST–aspartate aminotransferase; HBc–hepatitis B core antigen; HBsAg–hepatitis B surface antigen.*random selection of 50 patients seen between 2006 and 2007.**denominators lower than total number of patients due to missing data and exclusion of ambiguous cases.***sensitivity and specificity not available for algorithms A–C since the reference standard for sensitivity and specificity calculation derived from chart review of patients identified by algorithm C.