These EDTA tubes are used to obtain a whole blood or EDTA plasma sample.

• K2 or K3 potassium salt of EDTA (Ethylene Diamine Tetra Acetic acid) is used as an anticoagulant
• Aprotinin K3 EDTA tube is available for assays that require a proteolytic enzyme inhibitor

There are no functional differences between the two additives but physical difference between is K3EDTA is a liquid solution in the BD Vacutainer® glass tubes and K2 EDTA is a liquid solution that is spray coated onto the interior surface of the BD Vacutainer® plus tubes.