IMPROVACUTER® EDTA Tubes offer whole blood for whole blood haematology determinations. Generally, K2 or K3 Potassic Salt of EDTA is used as anticoagulant. The tubes inner wall is spray coated with the additive. IMPROVACUTER® EDTA Tubes can be used in direct sampling anaylzer without actually being opened. Blood smearing should be done within 3 hours after blood collection.