Capillary Blood  Collection  Tube  are coated withEDTAK2 or K3 for blocking coagulation cascade by binding calcicm ions in the blood sample.Capillary blood  collection  Tube is mainly used in collection. storage.pretreatment ant transportation of capillary blood specimen. It is suitable for newborn babies .infants and other patients who are not able to collect venous blood(like those with bad burn).It is also suitable for collecting small-volume venous blood specimen(usoally less than 1ml).The tube is made from virtually unbreakable and highly transparent pdypropylene.