title: Sperm recovering efficiency, a mathematical model, is designed to objectively evaluate semen processing techniques and methods.
abstract: OBJECTIVE
  To propose the sperm recovering efficiency (SRE) model, an equation that can be used to objectively quantify the technical skill of individual operators processing semen specimens in an andrology laboratory. Additionally, this equation can be used to compare different semen processing methods and protocols. This model integrates the semen parameters of initial sperm concentration, motility, morphology, and final sperm recovery to produce a unique number that can be used to compare results.
  
  
  METHODS
  A theoretical and deductive analysis.
  
  
  METHODS
  Private assisted reproductive units.
  
  
  METHODS
  None.
  
  
  METHODS
  None.
  
  
  METHODS
  Motile progressive and morphologically normal sperm concentration.
  
  
  RESULTS
  The SRE is a mathematical equation that can be used to compare initial semen parameters to postpreparation concentration, progressive motility, and normal morphology. The result is a number between 0 and 1. The model constitutes an objective means for determining the efficiency of a particular technique (gradients, migration, or filtration) or to set up the best conditions for that technique (time, gravities, medium volume, and sample volume). Additionally, the SRE permits comparisons between different operators, media, lots, laboratory conditions, treatments, and sample parameters. It can be used as a tool in laboratory quality control and for multicenter studies.
  
  
  CONCLUSIONS
  Sperm recovering efficiency (SRE) is an objective method to compare the results of semen processing techniques.
authors.affiliation: Reproductive Health Specialists, Joliet, Illinois 60435, USA. edosanz@hotmail.com
authors.forename: Eduardo
authors.initials: E
authors.lastname: Sanz
authors.forename: Roberto
authors.initials: R
authors.lastname: Olivares
mesh_terms: D002469:Cell Separation / Q000379:methods*; D006801:Humans; D008297:Male; D008433:Mathematics; D008962:Models, Theoretical; D012661:Semen / Q000166:cytology*; D013094:Spermatozoa / Q000166:cytology*