Ace the Vein Game: AMCA Phlebotomy Practice Exam 2026 – Draw Success!

The correct answer is whole blood specimen because the lavender tube, which typically contains EDTA as an anticoagulant, is specifically designed for the collection of blood that will be used for a complete blood count (CBC). The presence of EDTA prevents clotting, allowing for the assessment of various blood components, such as red blood cells, white blood cells, and platelets, in their natural, liquid state.

In contrast, plasma is the liquid component obtained after centrifuging whole blood treated with anticoagulants, while serum is the component that remains after clotting has occurred and the clot has been removed. Capillary blood is also not appropriate in this context, as it refers to blood collected from a fingertip or heel prick and is typically used in specific tests but not for a comprehensive CBC in a laboratory setting.