K2 EDTA Blood Tubes from Health Care Logistics can be used to perform a variety of blood chemistry tests without the need for retesting. Kits include durable plastic tubes and conventional lavender-colored caps spray-dried with K2 EDTA to prevent blood from clotting. Packages of 100 and cases of 1,000 are available, along with test tube racks in half or full sizes to keep the tubes upright and organized.