What is the color of the stopper of a Vacutainer blood specimen collection tube that contains the additives potassium oxalate or sodium fluoride?

Name: What is the color of the stopper of a Vacutainer blood specimen collection tube that contains the additives potassium oxalate or sodium fluoride?
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Quizplus · Accepted Answer

Gray stoppers in Vacutainer tubes indicate the presence of potassium oxalate or sodium fluoride, which are used as anticoagulants and glucose preservatives, respectively.

What Is the Color of the Stopper of a Vacutainer