Final answer:
Blood collection tubes without anticoagulants usually have red stoppers. The color coding system helps distinguish the tube type and its use in laboratory tests.
Step-by-step explanation:
The color of the stopper on a blood collection tube often indicates the presence or absence of certain additives, such as anticoagulants. Blood collection tubes without any anticoagulant typically have a red stopper. It is important to use the correct tube type for the tests ordered, as the presence or absence of an anticoagulant can significantly affect the results. The statement is false. A vautainer that contains no anticoagulant would have a colorless stopper. The purpose of an anticoagulant in a vautainer is to prevent the blood from clotting, so if there is no anticoagulant, the stopper would not need to be colored to indicate the presence of the anticoagulant. Instead, the color of the stopper would depend on the specific type of vautainer, which might vary based on the brand or purpose of the vautainer.