Assay reading apparatus and instruments, namely, analyzers for medical or veterinary use; medical diagnostic and immunodiagnostic apparatus and instruments; apparatus for carrying-out diagnostic tests for medical purposes; apparatus for sale in kit form for medical diagnostic purposes; medical diagnostic apparatus and instruments; optical components and detection apparatus for medical diagnostic use; apparatus for viewing diagnostic test cartridges; clinical bio-chemistry analyzers for medical or veterinary use; drug and biomarker testing cartridges adapted for use with electronic medical testing analyzers for medical purposes; drug and biomarker testing cartridges comprised of immunoassay test membranes adapted for use with electronic medical testing analyzers for medical purposes; kits comprising medical apparatus for testing for the presence of analytes in biological fluids, other fluids and other matrices, all for medical purposes; kits comprising medical apparatus for collecting and testing biological fluids for the presence of drugs, drug metabolites and biomarkers, for medical use