Blood cultures Yellow (SPS)
PT/INR Light Blue (Sodium Citrate)
PTT Light Blue (Sodium Citrate)
Laboratory Test Tube Color Codes and Definitions 1
,Page 2 Laboratory Test Tube Color Codes and Definitions
aPTT Light Blue (Sodium Citrate)
Fibrinogen Light Blue (Sodium Citrate)
D-dimer Light Blue (Sodium Citrate)
Laboratory Test Tube Color Codes and Definitions 2
, Page 3 Laboratory Test Tube Color Codes and Definitions
Thrombin time Light Blue (Sodium Citrate)
Rheumatoid factor Red (No Additive)
Rapid plasma regain (RPR) Red (No Additive)
Rubella IgG Red (No Additive)
C-reactive protein (CRP) Red (No Additive)
Cold agglutinins Red (No Additive)
Cryoglobulins Red (No Additive)
HIV Red (No Additive)
Laboratory Test Tube Color Codes and Definitions 3