Bio-Rad's Monolisa (TM) Anti-HBs EIA test kit, Labeled as, "MONOLISA TM Anti-HBs EIA 25220; || MONOLISA TM Anti-HBs Calibrator Kit 25219... Bio-Rad Laboratories Redmond, WA 98052" || For the qualitative detection of antibody to Hepatitis B Surface Antigen (anti-HBs) in Human Serum and EDTA or citrated plasma.