Arkray Pot. Oxalate Fluoride (7.5%W/V) is a liquid concentrate, specifically a biochemical reagent used in clinical laboratories to prepare sequestering tubes for blood sample collection, particularly for glucose testing. The 7.5% W/V concentration indicates a 7.5% weight/volume composition of the solution, which is a blend of potassium oxalate and potassium fluoride. This mixture acts as an anticoagulant to prevent blood clotting and as a glycolysis inhibitor, stopping the blood glucose from being metabolized by red blood cells. The concentrate is dispensed in drops into collection tubes to achieve the correct ratio of anticoagulant/inhibitor to blood volume.