OBJECTIVES: To determine the incidence of positive semen analysis 12 months after vasectomy clearance. SUBJECTS AND METHODS: A prospective study was undertaken, starting in 1990, of men undergoing vasectomy. Azoospermia was confirmed by two successive semen analyses 16 weeks after vasectomy. One year later a further sample was analysed for the presence of sperm. RESULTS: Of 1000 men who provided a sample for analysis, six men (0.6%) have had positive semen analyses 1 year after the initial tests showed azoospermia. In all six the sperm count was <10,000 per mL. Five of the six men produced a repeat sample 1 month later which, in all five cases, showed azoospermia. No pregnancies have been reported to date. CONCLUSION: Transitory reappearance of sperm following successful vasectomy occurs in about 0.6% of men. This incidence is 18 times greater than the reported pregnancy rate following successful vasectomy.
OBJECTIVES: To determine the incidence of positive semen analysis 12 months after vasectomy clearance. SUBJECTS AND METHODS: A prospective study was undertaken, starting in 1990, of men undergoing vasectomy. Azoospermia was confirmed by two successive semen analyses 16 weeks after vasectomy. One year later a further sample was analysed for the presence of sperm. RESULTS: Of 1000 men who provided a sample for analysis, six men (0.6%) have had positive semen analyses 1 year after the initial tests showed azoospermia. In all six the sperm count was <10,000 per mL. Five of the six men produced a repeat sample 1 month later which, in all five cases, showed azoospermia. No pregnancies have been reported to date. CONCLUSION: Transitory reappearance of sperm following successful vasectomy occurs in about 0.6% of men. This incidence is 18 times greater than the reported pregnancy rate following successful vasectomy.
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Keywords:
Biology; Demographic Factors; Examinations And Diagnoses; Family Planning; Genitalia; Genitalia, Male; Laboratory Examinations And Diagnoses; Laboratory Procedures; Male Sterilization; Physiology; Population; Population Dynamics; Prospective Studies; Research Methodology; Research Report; Semen; Seminal Vesicles; Sperm Count; Sterilization, Sexual; Studies; Time Factors; Urogenital System; Vasectomy
Authors: Francisco Barros de Oliveira; Vadelias Xavier Pereira; Fernando Rocha Oliveira; Luiz Carlos de Abreu; Blanca Elena Guerrero Daboin; Alex Rey Norberto; Luiz Vinicius de Alcantara Sousa; Luis Fernando B Tavares; Sidney Glina Journal: Clinics (Sao Paulo) Date: 2018-10-08 Impact factor: 2.365