CPT (Certified Phlebotomy Technician) Practice Exam

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What color tube is used for an A1C test?

Green
Yellow
Lavender
Red

The correct answer is: Lavender

The color tube used for an A1C test is indeed lavender. This color tube typically contains EDTA, an anticoagulant that prevents blood from clotting. The use of EDTA is crucial for tests like the A1C because it preserves the whole blood components necessary for accurate measurement of glycated hemoglobin levels. The A1C test specifically measures average blood glucose levels over a period of about two to three months, making the integrity of the sample important for reliable results. Therefore, lavender tubes, which are standard for hematology tests and many other tests requiring whole blood, are the appropriate choice for an A1C test. The other tube colors and their respective additives may not be suitable for this specific test, as they may either not preserve the blood components needed or may not be compatible with the testing requirements.