Verichem Laboratories’ Enzyme ER™ Verifier Kit™ was designed for calibration verification of serum kinetic assays on wet chemistry testing systems and contain nine clinical enzyme components covering 54 individual activity levels. The materials are intended to be treated as patient specimens and have a shelf life of 18 months. In addition, the material’s protein balance, pH, and ion content are constant across concentration levels for optimum linearity. The kit is packaged for multi-use and contains five milliliters of material for each of the six levels, with each level filled into easy-to-use polyethylene dropper vials.