Varicocele and Infertility Association

Prevalence and Association with Infertility

Approximately 35-40% of men presenting with infertility have varicoceles, indicating a significant association between varicocele and fertility problems 1, 2, 3
Varicocele is present in approximately 15% of the normal male population, but this percentage increases to 25% in men with abnormal semen analysis and 35-40% in men presenting with infertility, demonstrating a clear correlation between varicocele and fertility issues 1, 2, 3

The exact association between varicocele and reduced fertility remains incompletely understood, but several mechanisms have been proposed, including higher scrotal temperature, testicular hypoxia, and reflux of toxic metabolites that can cause testicular dysfunction and infertility through increased DNA damage 1, 2

Varicocele repair has been shown to improve semen parameters and fertility outcomes in men with clinical varicoceles and abnormal semen analysis 1, 2
Treatment of subclinical (non-palpable) varicoceles is not effective at increasing chances of spontaneous pregnancy 1, 2, 4
After varicocele repair, improvements in semen parameters typically take up to two spermatogenic cycles (approximately 3-6 months), with spontaneous pregnancy occurring between 6 and 12 months after varicocelectomy 1, 2

Treatment should be targeted to men with clinical varicoceles and abnormal semen parameters, as treatment of men with normal semen analysis or subclinical varicoceles is not recommended 1, 2
Varicocelectomy may also improve outcomes in men undergoing assisted reproductive technologies, with a meta-analysis showing improved outcomes following ART in oligozoospermic men (OR 1.69, 95% CI 0.95-3.02) 1, 2

Routine use of ultrasonography to identify non-palpable varicoceles is discouraged, as treatment of these subclinical varicoceles is not associated with improvement in either semen parameters or fertility rates 4, 5

The European Association of Urology strongly recommends treating infertile men with clinical varicoceles and abnormal semen parameters to improve fertility rates 6
Treatment should not be offered for subclinical varicoceles or in men with normal semen analysis, regardless of varicocele severity 6

Spontaneous pregnancy typically occurs between 6 and 12 months after varicocelectomy 7
Varicocelectomy may also improve outcomes in men undergoing assisted reproductive technologies 7

Severe varicoceles show greater improvement in sperm count after surgical repair compared to moderate or mild varicoceles 7