MedTest DX Assayed Human Multi Sera Control Level 1 (HNC200) and Level 2 (HEC200) || HEC200 || " Sml amber glass vial with rubber stopper and black plastic screw cap. || " 1 0 control vials per box, 12 cell foam insert. || HNC200 || " Sml amber glass vials with rubber stopper and green plastic screw cap. || " 1 0 control vials per box, 12 cell foam insert. || Product Usage: || MedTest DX Controls Level 1 and 2 is lyophilized human based control sera for use in the quality control of diagnostic assays. Human sera can be supplied as an assayed serum for control of accuracy or as a precision serum for control reproductivity. Concentration are available in 2 levels, normal (HNC) and elevated (HEC).