Why is immediate transport of light blue tubes important?

Immediate transport of light blue tubes is crucial primarily for maintaining sample integrity and avoiding changes in coagulation factors. Light blue tubes contain sodium citrate, an anticoagulant that preserves the blood sample for coagulation testing. When these samples are not transported immediately, there is a risk that factors involved in clotting may begin to change or degrade due to prolonged delays, leading to inaccurate test results.

Coagulation factors are time-sensitive; they can be affected by delays in processing, which may change their concentrations or functionality. This is particularly important for tests that rely on precise measurements of clotting ability, such as PT (Prothrombin Time) or aPTT (Activated Partial Thromboplastin Time). By ensuring these tubes are transported promptly, phlebotomists help to guarantee that the samples remain stable and reliable for accurate laboratory analysis.