Which tube is typically used for coagulation studies?

The light blue top tube is specifically designed for coagulation studies because it contains a sodium citrate anticoagulant that effectively prevents blood from clotting. This anticoagulant is essential for ensuring accurate test results in various coagulation assays, such as PT (Prothrombin Time) and PTT (Partial Thromboplastin Time). The citrate binds calcium ions, which are necessary for blood clotting, thereby preserving the plasma in a state suitable for testing.

In coagulation testing, it is crucial to maintain the proper blood-to-anticoagulant ratio, which is facilitated by using the light blue tube. This careful consideration allows laboratories to evaluate the coagulation pathways of the blood accurately. Other tubes, such as the green, red, or gold top tubes, are not suitable for coagulation tests as they contain different additives or no anticoagulant at all, which would lead to inaccurate or unreliable results in coagulation assessments.