Nnwale ule na-acha odo odo bụ dike nke ule usoro hematology, n'ihi na ethylenediaminetetraacetic acid (EDTA) n'ime ya nwere ike chelate ion calcium dị n'ọbara ọbara, wepụ calcium na saịtị mmeghachi omume, gbochie ma kwụsị usoro nhazi nke endogenous ma ọ bụ extrinsic coagulation usoro. iji gbochie nchikota nke ihe nlere anya, ma ọ nwere ike ime ka lymphocytes pụta ìhè n'ime oghere ndị yiri ifuru, ma nwee ike ịkpalite nchịkọta platelet dabere na EDTA.Ya mere, enweghị ike iji ya maka nyocha coagulation na ule ọrụ platelet.N'ozuzu, anyị na-atụgharị ma na-agwakọta ọbara ozugbo nchịkọta ọbara gasịrị, na ihe atụ ahụ dịkwa mkpa ka agwakọta ya tupu ule ahụ, na enweghị ike ịme ya.