Iyo yepepuru test tube igamba reiyo hematology system bvunzo, nekuti iyo ethylenediaminetetraacetic acid (EDTA) iri mairi inogona kunyatso chelate calcium ions musampuli yeropa, kubvisa karusiyamu kubva panzvimbo yekuita, kuvhara uye kumisa endogenous Kana extrinsic coagulation process. kudzivirira kubatana kwemuenzaniso, asi inogona kuita kuti lymphocytes ione semaruva-yakafanana nuclei, uye inogonawo kukurudzira EDTA-inotsamira kuunganidzwa kwemaplatelet.Naizvozvo, haigone kushandiswa pakuita coagulation kuyedza uye platelet basa bvunzo.Kazhinji, isu tinoshandura uye kusanganisa ropa pakarepo mushure mekuunganidzwa kweropa, uye mufananidzo wacho unodawo kusanganiswa pamberi pekuongororwa, uye haugone kuve centrifuged.