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Order of Draw

Blood cultures Yellow (SPS) First to minimize chance of microbial contamination
Coagulation tubes Light blue Second or third; must be first additive tube because all other additive tubes affect coagulation tests
Plain Non Additive tubes Red Prevents contamination by additives in other tubes must be drawn prior to a light blue top as a throw away tube if not ordered
Serum separator gel tubes Red and grey : gold Plastic Comes after specimens drawn for coagulation tests because it contains silica particles to activate clotting in the tube
Plasma tubes and plasma separator gel tubes Green and light green top Contains heparin, affects coagulation tests and interferes in collection of serum specimens and causes least interference in other tests
EDTA tubes Lavender, white Have more carry over (EDTA) problems than any other additive. Elevated sodium and potassium levels. Decreases calcium and iron levels
Oxalate/Fluoride tubes Gray Comes after hematology tubes because oxalate damages cell membranes and causes red blood cell morphology
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Created by: Larissa333