Which of the following tests requires the use of a blood collection tube with a gray stopper? 

A. Coagulation studies
B. Blood glucose tests
C. Viral studies
D. Arterial blood gases
E. Blood cultures

B. Blood glucose tests
Blood glucose tests require a blood collection tube that contains an anticoagulant such as potassium oxalate or sodium fluoride. These tubes have a gray stoppers.

Health Professions

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