What is EDTA Tube and How to Use it in Specimen Process?

What is EDTA Tube?
EDTA represents Ethylenediaminetetraacetic acid, which is the anticoagulant used for most hematology procedures (like identifying and counting blood cells, blood typing, etc.)
What is the Color of EDTA Tube?
Lavender "Purple".
What is EDTA Tube used for?
After treated by EDTA, the plasma can be used to measure most proteins. Moreover, it facilitates storing genetic material through EDTA buffy coats, which is the interface between the red cells and the plasma after centrifugation. 
Notice: Tubes may contain either K2 EDTA or K3 EDTA.
What is the difference between K2 an K3 EDTA Tube?
An anticoagulant used in blood collection processAn alternative anticoagulant of K2 EDTA
2 potassium ions3 potassium ions
Dipotassium ethylenediaminetetraacetic acidTripotassium ethylenediaminetetraacetic acid
Solution is dried in the interior surface of tubesSolution come as a liquid in tubes