A blood collection tube is a sterile glass or plastic tube with a plastic safety cap (with rubber stopper) used to collect blood for medical testing. The tube may contain additives to preserve the blood and prevent clotting, or to separate out different components of the blood for testing. Different colored tubes are used for different types of tests, and the phlebotomist must ensure they are using the correct tube for the specific test ordered. After the blood is collected, the tube is labeled with the patient's information and sent to the laboratory for analysis.

The use of blood collection tubes is an essential part of the medical testing process and ensures accurate and reliable results.

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