CPT (Certified Phlebotomy Technician) Practice Exam

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What color tube is used for a CBC?

Brown
Red
Blue
Lavender

The correct answer is: Lavender

The correct answer is D. Lavender tubes are used for a complete blood count (CBC) because they contain the anticoagulant EDTA, which helps preserve the blood sample by preventing it from clotting. This allows for an accurate count of different blood cell types present in the sample. Brown tubes (option A) are typically used for testing blood samples for trace element analysis, such as lead or copper levels. Red tubes (option B) are often used for serum testing, where the blood is allowed to clot and the serum is separated from the clotted blood cells. Blue tubes (option C) usually contain citrate and are used for coagulation studies.