title: Correlation of semen variables and pregnancy rates for donor insemination: a 15-year retrospective.
abstract: OBJECTIVE
  To determine the validity of the criteria currently used to select fertile sperm donors.
  
  
  METHODS
  Retrospective study of the outcome of donor insemination treatment cycles over a 15-year period.
  
  
  METHODS
  The Reproductive Medicine Clinic of Prince Henry's Institute of Medical Research (formerly Medical Research Centre, Prince Henry's Hospital, South Melbourne, Victoria, Australia).
  
  
  METHODS
  Couples (1,299) presented with severe male factor infertility (azoospermia or severe oligozoospermia) and were treated by donor insemination (10,796 treatment cycles) using cryopreserved semen from 292 normal healthy men aged between 18 and 46 years as sperm donors.
  
  
  METHODS
  Semen characteristics, including volume, count, motility, motility index, normal morphology, live cells, and post-thaw motility, were analyzed by logistic regression analysis to determine which groups of factors were related independently and significantly to pregnancy rates.
  
  
  RESULTS
  The pregnancy rate for donor insemination was 8.9% per cycle. By logistic regression count, normal morphology, post-thaw motility (%), and post-thaw motility index together explained 28% of the variance of the pregnancy rates. Other factors, including prethaw motility characteristics (percent motility and motility index), donor age, weight, LH, FSH, and T levels, were not significant.
  
  
  CONCLUSIONS
  The standard parameters of sperm count, morphology, and post-thaw motility are the most important factors for the selection of highly fertile donors. As most of the variability in the pregnancy rates resulted from other undetermined factors related both to the donor and the recipient, it is suggested that the pragmatic approach of discarding donors after a reasonable number of treatment failures (20 to 50) should continue.
authors.affiliation: Andrology Laboratory, Prince Henry's Institute of Medical Research, Monash Medical Centre, Clayton, Victoria, Australia.
authors.forename: R C
authors.initials: RC
authors.lastname: Johnston
authors.forename: G T
authors.initials: GT
authors.lastname: Kovacs
authors.forename: D H
authors.initials: DH
authors.lastname: Lording
authors.forename: H W
authors.initials: HW
authors.lastname: Baker
mesh_terms: D015925:Cryopreservation; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D006358:Hot Temperature; D006801:Humans; D007316:Insemination, Artificial, Heterologous; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D011247:Pregnancy; D012044:Regression Analysis; D012189:Retrospective Studies; D012661:Semen / Q000502:physiology*; D013081:Sperm Motility; D013094:Spermatozoa / Q000166:cytology / Q000502:physiology; D013739:Testosterone / Q000097:blood
chemical_list: D013739:Testosterone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone