Ethylenediamine tetraacetic acid (EDTA, molekyulu yolemera 292) ndi mchere wake ndi mtundu wa amino polycarboxylic acid, womwe ukhoza kutulutsa ayoni a calcium mu zitsanzo za magazi, chelate calcium kapena kuchotsa malo a calcium reaction, omwe adzatsekereza ndikuthetsa kutsekeka kwamkati kapena kunja. njira, kuti tipewe zitsanzo za magazi kuti zisatseke.Imagwiritsidwa ntchito pamayeso wamba a hematology, osati pakuyesa kwa coagulation ndi kuyesa kwa platelet, kapena kutsimikiza kwa calcium ion, potassium ion, sodium ion, ayoni yachitsulo, alkaline phosphatase, creatine kinase ndi leucine aminopeptidase ndi mayeso a PCR.