Streck’s CVA, an assayed linearity control kit used to determine the patient reportable range of 3-part and 5-part hematology instruments, is now assayed for the Beckman Coulter UniCel DxH 800. CVA establishes an instrument’s reportable range and verifies linearity, testing the extreme upper and lower limits of an instrument, ensuring patient results are valid. Each kit has customized ranges appropriate for each instrument model and provides instrument-specific assay values for white blood cell (WBC), platelet (PLT), red blood cell, and hemoglobin parameters. WBC and PLT parameters have extended ranges, providing values up to 410,000 and 3.5 million for instruments with extended linearities. The kit has an open-vial stability of five days and a closed-vial stability of 120 days.