AcroMetrix® Citrate Plasma Dilution Matrix provides manufacturing firms, clinical laboratories, and blood banks with well-characterized, pre-screened negative diluent for use in making these preliminary dilutions. The use of a standard dilution matrix also allows testing laboratories and other end users to compare results obtained at different times, by different operators, or by different methodologies, and ensure that the sample diluent is not contributing to testing variability. This is a general purpose reagent (GPR).