Lub raj ntshav kuaj ntshav yog tus phab ej ntawm kev kuaj ntshav hematology, vim tias ethylenediaminetetraacetic acid (EDTA) hauv nws tuaj yeem ua rau cov calcium ions zoo hauv cov ntshav, tshem tawm cov calcium los ntawm qhov chaw tshuaj tiv thaiv, thaiv thiab nres cov txheej txheem endogenous lossis extrinsic coagulation. txhawm rau tiv thaiv cov coagulation ntawm cov hnoos qeev, tab sis nws tuaj yeem ua rau cov lymphocytes tshwm paj zoo li cov nuclei, thiab tseem tuaj yeem txhawb nqa EDTA-nyob ntawm kev sib sau ntawm cov platelets.Yog li ntawd, nws tsis tuaj yeem siv rau kev sim coagulation thiab kev kuaj ntshav platelet.Feem ntau, peb thim rov qab thiab sib tov cov ntshav tam sim tom qab sau cov ntshav, thiab cov qauv kuj yuav tsum tau muab sib xyaw ua ntej kev sim, thiab tsis tuaj yeem centrifuged.