... phlebotomist collect whole blood into a purple, blue or green top collection tube (containing EDTA, citrate or heparin, respectively) ... phlebotomist collect whole blood into a purple, blue or green top collection tube (containing EDTA, citrate or heparin, respectively) ... . Have a certified phlebotomist collect whole blood into a red top collection tube (containing no anticoagulants) by veinpuncture.2. ...