Whole blood controls designed for use with most 3-part differential hematology analyzers. Tri level 3PD controls are packaged 6 x 3.0 ml configuration. Each pack contains 2 vials of each level (Low, Normal, High). Comprehensive Quality Assurance Program (CQAP) available at no charge with the purchase of these products. 110-day closed vial stability. 14-day open vial stability.