title: The role of albumin in the calculation of free and bioavailable testosterone in women with hyperandrogenemia.
abstract: BACKGROUND
  The aim of this study was to assess the role of albumin in the calculation of free testosterone (cFT) and bioavailable testosterone (cBT).
  
  
  METHODS
  Ninety-two healthy women, who presented at our fertility center for evaluation of possible hyperandrogenemia, were included in the study. Total blood testosterone (TT), free testosterone (FT) and sex hormone-binding globulin (SHBG) were measured using commercially available enzyme immunoassays in one serum sample. cFT and cBT were then calculated, taking into account the individual albumin concentration, but without taking account of each individual albumin serum concentration.
  
  
  RESULTS
  No differences were observed in the calculated values for FT and BT, with or without taking into account the individual albumin concentration. A correlation between the two was demonstrated.
  
  
  CONCLUSIONS
  For clinical routine work, it is not necessary to estimate the individual albumin concentration in hyperandrogenic women in order to calculate the FT and BT concentrations from TT and SHBG serum concentrations, when the albumin concentration is in the physiological range of 40-50 g/L.
authors.affiliation: Department of Obstetrics and Gynecology, Erlangen University Hospital, D-91054 Erlangen, Germany. andreas.mueller@gyn.imed.uni-erlangen.de
authors.forename: Andreas
authors.initials: A
authors.lastname: Mueller
authors.forename: Susanne
authors.initials: S
authors.lastname: Cupisti
authors.forename: Helge
authors.initials: H
authors.lastname: Binder
authors.forename: Inge
authors.initials: I
authors.lastname: Hoffmann
authors.forename: Matthias W
authors.initials: MW
authors.lastname: Beckmann
authors.forename: Ralf
authors.initials: R
authors.lastname: Dittrich
mesh_terms: D000328:Adult; D000728:Androgens / Q000097:blood; D001682:Biological Availability; D005260:Female; D006801:Humans; D017588:Hyperandrogenism / Q000097:blood*; D007118:Immunoassay; D012709:Serum Albumin / Q000032:analysis / Q000378:metabolism*; D012738:Sex Hormone-Binding Globulin / Q000032:analysis* / Q000378:metabolism; D013739:Testosterone / Q000097:blood* / Q000493:pharmacokinetics*
chemical_list: D000728:Androgens; D012709:Serum Albumin; D012738:Sex Hormone-Binding Globulin; D013739:Testosterone