What is the most common blood collection tube used for phlebotomy?

The lavender-top tube, which contains EDTA (ethylenediaminetetraacetic acid), is the most common blood collection tube used for phlebotomy primarily because it is designed for hematology tests, including complete blood counts (CBC) and blood smears. EDTA acts as an anticoagulant, preventing blood from clotting, which is essential for accurate measurement of the formed elements in blood, such as red blood cells, white blood cells, and platelets.

The popularity of the lavender-top tube in clinical settings is attributed to the frequency of laboratory tests that require whole blood or plasma samples treated with an anticoagulant, making it a staple in phlebotomy practices. Additionally, its comprehensive utility for various hematological parameters supports its status as the go-to collection tube among healthcare professionals.