title: Adenosine triphosphate in semen and other sperm characteristics: their relevance for fertility prediction in men with normal sperm concentration. World Health Organization Task Force on the Prevention and Management of Infertility.
abstract: OBJECTIVE
  To evaluate the power of sperm characteristics and of the semen content of adenosine triphosphate (ATP) in predicting the occurrence of pregnancy in infertile couples.
  
  
  METHODS
  This is a prospective study monitoring the occurrence of pregnancy during 400 days of follow-up.
  
  
  METHODS
  Couples were recruited in 10 centers, and data were analyzed at the World Health Organization Headquarters.
  
  
  METHODS
  Of 361 couples recruited, 306 satisfied the following criteria: infertility of at least 12 months' duration, anatomically normal female ovulating regularly, sperm concentration greater than 20 x 10(6)/mL, valid semen data, and ATP available before conception.
  
  
  METHODS
  None.
  
  
  METHODS
  The occurrence of pregnancy.
  
  
  RESULTS
  Ninety-six couples (31.4%) achieved conception. Duration of infertility less than 3 years was associated with higher conception rate (41.1%) than longer duration (28.2%). None of the semen characteristics nor the ATP content predicted the occurrence of pregnancy.
  
  
  CONCLUSIONS
  Neither conventional sperm characteristics nor semen ATP can predict the occurrence of pregnancy among couples in which the female partner is normal and the male partner has sperm concentration greater than 20 x 10(6)/mL.
mesh_terms: D000255:Adenosine Triphosphate / Q000032:analysis*; D000328:Adult; D000367:Age Factors; D015415:Biomarkers; D005260:Female; D005298:Fertility; D006801:Humans; D007248:Infertility, Male / Q000503:physiopathology*; D008297:Male; D011247:Pregnancy; D011446:Prospective Studies; D012016:Reference Values; D012661:Semen / Q000737:chemistry / Q000502:physiology*; D013076:Sperm Count; D013094:Spermatozoa / Q000502:physiology*
chemical_list: D015415:Biomarkers; D000255:Adenosine Triphosphate