title: The effects of ejaculation on serum prostate specific antigen.
abstract: OBJECTIVE
  We evaluated the correlation of prostate specific antigen (PSA) and ejaculation in patients with symptomatic benign prostatic hyperplasia and an active sexual life.
  
  
  METHODS
  In a study of 40 patients 50 to 60 years old (mean age 55) with prostatic symptoms serum PSA was evaluated before as well as 1 and 7 days after ejaculation. Due to clinical significance of PSA in diagnosis and monitoring of prostate cancer, we included men at risk age and with an active sex life.
  
  
  RESULTS
  The results were compared to those of a control group of 10 asymptomatic (without coitus) men 50 to 60 years old (mean age 55 years). There were no statistically significant differences in PSA levels before and after ejaculation or between the groups. These results suggested that there was no physiological relationship between ejaculation and PSA level.
  
  
  CONCLUSIONS
  Based on our data we conclude that sexual activity does not preclude the use of PSA to screen men for prostatic cancer.
authors.affiliation: Division of Urology, Hospital Beneficência Portuguesa, São Paulo, Brazil.
authors.forename: N R
authors.initials: NR
authors.lastname: Netto
authors.forename: F
authors.initials: F
authors.lastname: Apuzzo
authors.forename: E
authors.initials: E
authors.lastname: de Andrade
authors.forename: G B
authors.initials: GB
authors.lastname: Srulzon
authors.forename: P L
authors.initials: PL
authors.lastname: Cortado
authors.forename: M L
authors.initials: ML
authors.lastname: Lima
mesh_terms: D004542:Ejaculation / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D017430:Prostate-Specific Antigen / Q000097:blood*; D011470:Prostatic Hyperplasia / Q000097:blood; D011471:Prostatic Neoplasms / Q000175:diagnosis
chemical_list: D017430:Prostate-Specific Antigen