EDTA is the anticoagulant of choice for hematology tests because it perfectly preserves the cellular components of blood. It works by chelating (binding) calcium ions (Ca2+). Calcium is an essential cofactor for many steps in the coagulation cascade. By removing free calcium from the blood sample, EDTA effectively prevents the entire sequence of clotting reactions from starting. This keeps the blood in a liquid state, allowing automated analyzers to count and size the individual blood cells (red cells, white cells, platelets) accurately and without interference from clots. Tubes containing EDTA are typically lavender or purple topped. It is important to mix the tube gently but thoroughly immediately after collection to ensure the EDTA is evenly distributed and to prevent clot formation.

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Zambia

• Joseph Soko – 101 pts

• Visual Pathway Lesions
• Positive and Negative Symptoms
• Hallucinations and Delusions
• Antipsychotic Medications
• Emergency: Environmental Emergencies