What type of testing uses a light blue top tube?

The light blue top tube is specifically designed for coagulation studies, which include tests such as prothrombin time (PT) and activated partial thromboplastin time (aPTT). This tube contains sodium citrate as an anticoagulant, which is crucial because it helps preserve the integrity of the blood sample by preventing clotting until the specimen can be processed. The unique composition of the light blue top tube ensures accurate results in coagulation tests, which measure how well and how quickly blood clots.

Other tests, such as serology tests, electrolyte tests, and glucose monitoring, typically require different types of tubes with their specific additives, and might not yield reliable results if drawn in a light blue top tube due to the sodium citrate's anticoagulation properties. Understanding the specific purpose of each tube type is essential for maintaining the quality and reliability of lab tests.