The Edta Di Sodium is a chelating agent that rids the body of toxic metals. A chelant is a molecule that can create more than one different bond with only one metal ion. It then stabilizes the metal ion so that it cannot react with other substances and the body can eliminate it. EDTA chelates the calcium present in the blood specimen, arresting the coagulation process and preserving blood cell morphology. Edta Di Sodium is very useful.