Blood collection tubes (also known as vacutainer tubes) are used for collecting and storing blood samples for laboratory testing. Blood collection tubes are specifically designed to draw, hold, and transport a specific volume and type of blood specimen, such as whole blood, plasma, or serum, depending on the type of tests that will be performed. The tubes are filled with various additives to prevent the blood from clotting or to preserve certain blood components for analysis. Blood collection tubes are essential tools in diagnostic medicine, used to aid healthcare professionals in diagnosing and monitoring various medical conditions.