CONTROL, HEMOGLOBIN F/USE W/HEMOCUE HB 801 SYSTEM DUO NORMAL Hemoglobin solution matrix based on a purified hemolysate optimized for the HemoCue® Hb 301 and Hb801 systems Long refrigerated shelf life, minimizing lot-to-lot variations and helping to ensure long-term test consistency HemoTrol® Duo is an assayed quality control material for professional use to verify the performance characteristics of the HemoCue® Hb 301 and HemoCue® Hb 801 System