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Blood Collection
Blood Collection Tubes
| Stopper Color | Additive and Test Type |
|---|---|
| Yellow | Sodium polyanetholsulfonate; Blood cultures |
| Light Blue | Sodium citrate; Coagulation studies |
| Red | Clot activator (silicone coated); Blood chemistries, HIV/AIDS antibody, viral studies, and serologic tests |
| Gold or red/gray | Clot activator (silicone serum separator); Tests requiring blood serum, routine blood donor screening, and infectious disease testing |
| Green | Heparin; Electrolyte studies and arterial blood gases |
| Lavender | Ethylenediaminetetraacetic acid (EDTA) (anticoagulant); Hematology studies |
| Gray | Potassium oxalate or sodium fluoride (anticoagulant); Blood glucose |