🔬Lab & Specimen Handling

Why do labs request multiple tubes?

Different tests require different anticoagulants or tube additives. Some require separate samples to avoid cross-contamination.

Blood tube types differ in what they contain:

SST (gold): Clot activator + gel separator — for serum-based tests

EDTA (lavender): EDTA anticoagulant — for CBC and molecular testing

Sodium citrate (blue): Citrate anticoagulant in specific 9:1 ratio — for coagulation

Lithium heparin (green): Heparin anticoagulant — for plasma chemistry

Mixing anticoagulants would invalidate many tests, so each tube type is collected separately and used for specific analyses.

Need a Provider?

Find a certified mobile phlebotomist in your area, available for same-day appointments.