K2 EDTA Tubes Specifications: Tube Size: 13-100 5.2mGs Membran Filtered EDTA K2 Sprayed Description EDTA stands for Ethylenedia minetetraacetic acid. EDTA functions by binding calcium in the blood and keeping the blood from clotting. It is used mostly i n Hematology studies: CBC, WBC Count, Hemoglobin, Hematocrit, Platelet Count, Reticulocyte count, and differential.