These K3 EDTA Haematology Vacuum Tube are supplied by Chargen Life Sciences, a reliable name in the field. These 5 ml K3 EDTA vacuum tubes are made from high quality, premium grade PET material and are disposable in nature. They measure 13 X 100 mm. They are also sterile and widely used by laboratories, clinics and hospitals. These 5 ml K3 EDTA vacuum tubes are used in clinical hematological examination, routine blood tests, whole blood testing, cross matching etc. These tubes contain K3 EDTA as an anticoagulant. EDTA is Ethylenediaminetetraacetic acid. EDTA functions by binding to th calcium in blood and stoping the blood from clotting. It strongly and irreversibly chelates i.e. binds to the calcium ionsin the blood. In these lavender capped bottles, the nominal EDTA concentration is about 1.8 mg of EDTA per milliliter of blood. These tubes are used mainly by hematologists for routine tests.