title: Biological variation of the leukocyte differential count quantities.
abstract: The biological variation of the blood concentration and number fraction of the different kinds of leukocytes have been estimated, over a one-year period in a group of 19 women and 20 men, apparently healthy volunteers. All measurements have been performed with a Toa E-5000 haematological analyser. The medians of the within-subject biological coefficients of variation, separated by sex when significant differences exist, are the following for concentrations: 9.4% in men and 15.4% in women for the leukocytes, 16.9% in men and 26.9% in women for the neutrophils, 12.3% for the lymphocytes, 14.9 for the basophils+eosinophils+monocytes (as measured by Toa E-5000); and for number fraction are the following: 8.6% for neutrophils, 0% in men and 7.2% in women for lymphocytes, and 16.7 for basophils+eosinophils+monocytes (as measured by Toa E-5000). With these data the index of individuality, the critical difference for significant change detection and the desirable imprecision have been calculated.
authors.affiliation: Laboratori d'Anàlisis Clíniques, Hospital de Viladecans, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Dot
authors.forename: J
authors.initials: J
authors.lastname: Miró
authors.forename: X
authors.initials: X
authors.lastname: Fuentes-Arderiu
mesh_terms: D000328:Adult; D001491:Basophils / Q000166:cytology; D004804:Eosinophils / Q000166:cytology; D005260:Female; D006801:Humans; D007958:Leukocyte Count; D008214:Lymphocytes / Q000166:cytology; D008297:Male; D008875:Middle Aged; D009000:Monocytes / Q000166:cytology; D009504:Neutrophils / Q000166:cytology; D012016:Reference Values