PhlebotomyQuestion 57 of 100
A gray-top tube containing sodium fluoride is most appropriate for which test?
a.Glucose or lactate levels
b.Complete blood count
c.Coagulation studies (PT/INR)
d.Blood typing
Explanation
The gray-top tube contains sodium fluoride, an antiglycolytic agent that preserves glucose by preventing cells from metabolizing it, making it ideal for glucose and lactate testing. Potassium oxalate is often included as an anticoagulant. It is drawn last in the standard order of draw.
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