What tubes do phlobotomists use for drawing A1C?

Phlebotomists typically use purple or lavender-top tubes containing EDTA (ethylenediaminetetraacetic acid) for drawing blood samples for A1C tests. These tubes help preserve the blood sample for accurate analysis of hemoglobin A1C levels. In some cases, a green-top tube with heparin may also be used, but the purple tube is the most common choice.