A material which is used to verify the performance of a number of assays intended to be used for the qualitative and/or quantitative detection of antigens and/or antibodies from one or multiple blood-borne viruses, in a clinical specimen. Viruses intended to be detected may include (but are not limited to) human immunodeficiency virus 1 and 2 (HIV1 and HIV2), Hepatitis B virus, Hepatitis C virus and human T-cell lymphotrophic virus 1 and/or 2 (HTLV1 and/or HTLV2).