Used primarily in medical laboratories to prevent blood clotting in collected samples. It works by binding calcium ions in the blood, which are essential for the coagulation process. Commonly found in vacutainer tubes for hematological and biochemical testing. Due to its fast action and effectiveness, it is especially useful in emergency diagnostics and routine blood analysis. However, it is not suitable for blood clotting studies or calcium level measurements, as it interferes with these tests. Often used in combination with other agents to improve sample stability.