Which tests are commonly performed using the light blue tube?

The light blue tube is specifically used for coagulation studies, which is why the prothrombin time (PT) and D-Dimer tests are performed using this tube. This tube typically contains sodium citrate, an anticoagulant that helps preserve the integrity of blood samples for these particular tests by preventing coagulation. The sodium citrate in the light blue tube is calibrated to maintain a specific ratio with the blood, which is essential for accurate results in coagulation assays.

The prothrombin time test is crucial for evaluating the extrinsic pathway of coagulation, while the D-Dimer test helps to assess the presence of fibrin degradation products in the blood, often used in evaluating clotting disorders. These are both essential in diagnosing conditions related to improper coagulation.

In contrast, the other tests mentioned—basic metabolic panels, complete blood counts, and serum electrolytes—are typically performed using different types of tubes that contain other anticoagulants or additives suited for their specific analytical requirements. For example, a serum separator tube or lavender tube is used for those other tests, as they do not focus on coagulation.