Which additive preserves glucose in a blood sample for 1-5 days and is used in a grey-lid tube?

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Multiple Choice

Which additive preserves glucose in a blood sample for 1-5 days and is used in a grey-lid tube?

Explanation:
Preserving glucose after blood collection hinges on blocking glycolysis so the sugar level doesn’t drop as cells consume glucose. The gray-lid tube provides this by combining sodium fluoride, a glycolysis inhibitor, with potassium oxalate, an anticoagulant. Inhibiting glycolysis prevents the breakdown of glucose, helping maintain accurate levels for several days when the sample is kept appropriately. The other additives don’t both inhibit glycolysis and prevent clotting in a way suitable for glucose testing, so they won’t preserve glucose over days the way fluoride-oxalate does.

Preserving glucose after blood collection hinges on blocking glycolysis so the sugar level doesn’t drop as cells consume glucose. The gray-lid tube provides this by combining sodium fluoride, a glycolysis inhibitor, with potassium oxalate, an anticoagulant. Inhibiting glycolysis prevents the breakdown of glucose, helping maintain accurate levels for several days when the sample is kept appropriately. The other additives don’t both inhibit glycolysis and prevent clotting in a way suitable for glucose testing, so they won’t preserve glucose over days the way fluoride-oxalate does.

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