Shandong ChengWu Medical Product Factory

EDTA in a test tube prevents blood clotting and preserves cellular components such as red blood cells, white blood cells, and platelets. It is commonly used for complete blood count (CBC) tests, blood grouping, and other hematology tests.

The main reason for using EDTA in purple top tubes is its strong anticoagulant properties. When blood is collected, the natural clotting process begins immediately. Without an anticoagulant, a blood sample can clot, making it unusable for many analyses. By binding to calcium ions, EDTA inhibits the coagulation process, leaving the sample in a liquid state.