Bututun gwajin shunayya shine gwarzon gwajin tsarin jini, saboda ethylenediaminetetraacetic acid (EDTA) a cikinsa na iya sarrafa sinadarin calcium a cikin samfurin jini yadda ya kamata, cire calcium daga wurin da ake amsawa, toshewa kuma ya dakatar da tsarin coagulation na endogenous Ko extrinsic coagulation. don hana coagulation na samfurin, amma yana iya sa lymphocytes su bayyana tsakiya masu siffar fure, kuma suna iya tayar da EDTA da ke dogara da tarin platelets.Don haka, ba za a iya amfani da shi don gwaje-gwajen coagulation da gwajin aikin platelet ba.Gabaɗaya, muna jujjuya da haɗa jinin nan da nan bayan an tattara jinin, kuma samfurin kuma yana buƙatar a haɗa shi kafin gwajin, kuma ba za a iya sanya shi a tsakiya ba.