Potassium is an additive in which color-topped tube?

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Prepare for the NPS Phlebotomy Exam with flashcards and multiple-choice questions, each question includes hints and detailed explanations. Ace your test!

Multiple Choice

Potassium is an additive in which color-topped tube?

Explanation:
Potassium is present as part of the additive in the gray-topped tube. Its anticoagulant is potassium oxalate, which prevents blood from clotting, and this tube also contains sodium fluoride to inhibit glycolysis and preserve glucose. That combination—potassium oxalate with fluoride—defines gray tubes, differentiating them from other color tubes (green with heparin, lavender with EDTA, red with no additive).

Potassium is present as part of the additive in the gray-topped tube. Its anticoagulant is potassium oxalate, which prevents blood from clotting, and this tube also contains sodium fluoride to inhibit glycolysis and preserve glucose. That combination—potassium oxalate with fluoride—defines gray tubes, differentiating them from other color tubes (green with heparin, lavender with EDTA, red with no additive).

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