title: Reference intervals for eight measurands of the blood count in a large population based study.
abstract: BACKGROUND
  The blood count is widely used in clinical practice. Well defined reference intervals for each measurand are essential for correct clinical interpretation of results. Most previous studies have not been population-based. We therefore calculated reference intervals for several hematological measurands from a sample of the general adult population of Northeastern Germany.
  
  
  RESULTS
  We used data from 2967 healthy individuals recruited for the population-based Study of Health in Pomerania (SHIP). Reference intervals were calculated according to the guidelines of the Clinical and Laboratory Standards Institute (CLSI) using the bootstrap method for the age range from 20 to 79 years and, in addition, stratified according to age and gender with both bootstrap and quantile regression procedures. Reference ranges for erythrocytes, hemoglobin and hematocrit increased with age in women but decreased in men.
  
  
  CONCLUSIONS
  Our reference intervals were lower than those previously published for erythrocytes, hemoglobin, hematocrit and leukocytes but higher for Mean Corpuscular Volume (MCV) and Mean Corpuscular Hemoglobin (MCH). Different laboratory methods and study populations may lead to disparity in results.
authors.affiliation: Institute of Clinical Chemistry and Laboratory Medicine, University of Greifswald, Germany. till.ittermann@uni-greifswald.de
authors.forename: Till
authors.initials: T
authors.lastname: Ittermann
authors.forename: Markus
authors.initials: M
authors.lastname: Roser
authors.forename: Graham
authors.initials: G
authors.lastname: Wood
authors.forename: Helma
authors.initials: H
authors.lastname: Preez
authors.forename: Jan
authors.initials: J
authors.lastname: Lüdemann
authors.forename: Henry
authors.initials: H
authors.lastname: Völzke
authors.forename: Matthias
authors.initials: M
authors.lastname: Nauck
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000375:Aging / Q000502:physiology; D001772:Blood Cell Count / Q000379:methods* / Q000592:standards; D004906:Erythrocyte Count; D005260:Female; D005858:Germany; D006400:Hematocrit; D006801:Humans; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged; D010976:Platelet Count; D012016:Reference Values; D012727:Sex Characteristics; D055815:Young Adult