6b23daca_rs___Mayo_Medical_Laboratories__Procedural_Steps
[0] 10 [Impact on Testing] • Recommended order of draw • Blood culture tube • Coagulation tube (light-blue top) • Serum tube with or without clot activator, with or without gel (red top) • Heparin tube (green top) • EDTA tube (lavender or pearl top) • Glycolytic inhibitor tube (grey top) • Plastic or glass serum tubes containing a clot activator may cause interference in coagulation testing. Glass nonadditive serum tubes or plastic serum tubes without a clot activator may be drawn before the coagulation tube. [Procedural Steps] 
Fill tubes using the correct order of draw
Communiqué - Preanalytic Laboratory Errors - Mayo Medical Laboratories
Procedural Steps