CPT (Certified Phlebotomy Technician) Practice Exam

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What color tube is used for an A1C?

Red
Green
Yellow
Lavender

The correct answer is: Lavender

The correct choice for the color tube used for an A1C test is the lavender tube. This tube contains EDTA, an anticoagulant that helps prevent blood from clotting. The A1C test, which measures the average blood glucose levels over the past two to three months, requires whole blood for accurate results, making the lavender tube an appropriate choice. The EDTA in this tube preserves the blood sample and allows for reliable testing of hemoglobin A1C. Other color tubes serve different purposes: the red tube generally does not contain any additives and is used for serum testing, the green tube contains heparin which is used for tests requiring plasma, and the yellow tube typically has either a citrate or a serum separator for various types of tests. Thus, none of these options are suitable for an A1C test, making the lavender tube the ideal candidate.