Ityhubhu yovavanyo emfusa ligorha lovavanyo lwenkqubo ye-hematology, kuba i-ethylenediaminetetraacetic acid (EDTA) kuyo inokwenza ngokufanelekileyo i-calcium ion kwisampulu yegazi, isuse i-calcium kwindawo yokusabela, ibhloke kwaye imise inkqubo ye-endogenous Or extrinsic coagulation. ukuthintela ukujiya kwesampulu, kodwa ingenza ukuba i-lymphocyte ibonakale i-nuclei emile okwentyatyambo, kwaye ingavuselela ukudityaniswa kweeplatelet ezixhomekeke kwi-EDTA.Ke ngoko, ayinakusetyenziselwa uvavanyo lwe-coagulation kunye novavanyo lomsebenzi weplatelet.Ngokuqhelekileyo, siyayiguqula kwaye sixube igazi ngokukhawuleza emva kokuqokelelwa kwegazi, kwaye isampuli nayo kufuneka ixutywe phambi kovavanyo, kwaye ayikwazi ukuba i-centrifuged.