Ethylenediamine tetraacetic acid (EDTA, kwayoyin nauyin 292) da gishiri wani nau'i ne na amino polycarboxylic acid, wanda zai iya daidaita ions calcium a cikin samfuran jini yadda ya kamata, chelate calcium ko cire wurin amsawar calcium, wanda zai toshe da kuma ƙarewar coagulation na endogenous ko exogenous coagulation. tsari, don hana samfuran jini daga coagulation.Yana da amfani ga gwajin jini na gabaɗaya, ba don gwajin coagulation da gwajin aikin platelet ba, kuma ba don ƙaddarar calcium ion, potassium ion, sodium ion, iron ion, alkaline phosphatase, creatine kinase da leucine aminopeptidase da gwajin PCR.