✔EDTA works by binding to calcium ions in the blood, which prevents the blood from clotting
✔This allows for the preservation of blood cells and is essential for accurate hematology testing. tests performed using purple top Vacutainers; Complete blood count (CBC): This is a comprehensive test that measures various components of the blood, including red blood cells, white blood cells, platelets, and hemoglobin. Blood typing and crossmatching: These tests determine a person's blood type and identify compatible blood for transfusion.