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Question 8 of 20 · Phlebotomy0:42
Tube additives
A gray top tube with sodium fluoride is most often used for which test?
AComplete blood count
BGlucose
CProthrombin time
DBlood type
Why B is correct. Sodium fluoride stops cells from using glucose, so the level stays accurate.
Why A is wrong. YOUR ANSWER
A CBC uses the lavender EDTA tube.
Exam tactic: Gray = glucose preserved.
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