CPT (Certified Phlebotomy Technician) Practice Exam

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Prepare for the Certified Phlebotomy Technician Exam with our engaging quiz featuring flashcards and multiple-choice questions that include hints and explanations. Achieve success on your phlebotomy certification journey!

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What chemical additive is in a light blue tube?

EDTA
Citrate
Heparin
Silicone

The correct answer is: Citrate

The correct answer is B. Citrate. A light blue tube typically contains sodium citrate as an anticoagulant. This chemical additive is used to ensure that the blood does not clot during the testing process, making it suitable for tests that require plasma as a specimen. Options A, C, and D are incorrect: A. EDTA is commonly found in lavender and pink tubes, not light blue tubes. C. Heparin is typically used in green-top tubes or some tubes with a green additive, not light blue tubes. D. Silicone is used in some serum separator tubes (SST), which are usually gold or red-gray in color, but not in light blue tubes.