title: Health-associated reference values for arginine, asymmetric dimethylarginine (ADMA) and symmetric dimethylarginine (SDMA) measured with high-performance liquid chromatography.
abstract: OBJECTIVE
  Asymmetric dimethylarginine (ADMA) is an endogenous inhibitor of nitric oxide production. It has been implicated in various pathological processes, especially processes involving the cardiovascular system. Plasma concentration of ADMA (p-ADMA) has been measured in several studies with different techniques, and a wide range of normal values has been published. With use of high performance liquid chromatography (HPLC) with fluorescence detection, we have established health-associated reference values for p-ADMA, p-arginine, p-SDMA and the p-arginine/p-ADMA and p-arginine/p-SDMA ratios.
  
  
  METHODS
  Blood samples were taken from 238 blood donors (112 F and 126 M). HPLC was used to analyse arginine, ADMA and SDMA. Reference values are presented as 2.5 and 97.5 percentiles estimated by the bootstrap method.
  
  
  RESULTS
  The reference interval for p-ADMA is 0.40-0.77 micromol/L for the whole population, 0.41-0.79 micromol/L for men, 0.38-0.73 micromol/L for women 45 years or less, and 0.41-0.84 micromol/L for women >45 years.
  
  
  CONCLUSIONS
  Age affects p-ADMA in healthy women, but not in men.
authors.affiliation: Department of Medical Biochemistry, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway. gghov@hotmail.com
authors.forename: G Garmo
authors.initials: GG
authors.lastname: Hov
authors.forename: E
authors.initials: E
authors.lastname: Sagen
authors.forename: A
authors.initials: A
authors.lastname: Bigonah
authors.forename: A
authors.initials: A
authors.lastname: Asberg
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D001120:Arginine / Q000031:analogs & derivatives* / Q000097:blood*; D002851:Chromatography, High Pressure Liquid; D005260:Female; D006262:Health; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values
chemical_list: C024917:symmetric dimethylarginine; C018524:N,N-dimethylarginine; D001120:Arginine