Keywords: تجزیه و تحلیل شیمیایی خون; ADAMTS-13; a disintegrin and metalloproteinase with a thrombospondin type 1 motif, member 13; CV; coefficient of variation; EDTA; ethylenediaminetetraacetic acid; ELISA; enzyme-linked immunosorbent assay; EMSI; Examination Management Services, Inc.; ERL;