A varicocele diagnosis can leave you with more questions than answers. You may be told that it is common, that it often needs no treatment and that you should return if it becomes painful. What is not always explained is how a varicocele may relate to sperm health.
A varicocele is frequently identified during investigations for male-factor infertility, but having one does not mean you are infertile. A semen test can show whether key sperm parameters may be affected, although it cannot confirm that the varicocele is the cause.
What a varicocele may mean for sperm production
The veins around each testicle, known as the pampiniform plexus, help regulate temperature. Sperm production works best when the testicles remain a few degrees below core body temperature. When these veins become enlarged, blood flow and temperature regulation around the testicle may change. Our guide to testicle temperature and heat exposure explains why this matters.
Raised scrotal temperature and oxidative stress are among the mechanisms most often discussed in the research. Any effect on sperm production develops over time rather than appearing immediately.
Varicoceles are common. Patient information from Liverpool University Hospitals describes a varicocele as a collection of enlarged veins that often causes no symptoms, with treatment not needed in most cases.
Påvirker en varicocele alltid fruktbarheten?
No. Most men with a varicocele are not infertile. A varicocele may be associated with changes in semen quality, but it does not determine an individual fertility outcome.
A population study of 7,035 young men across six European countries, published in European Urology in 2016, found that varicocele was associated with poorer semen quality and altered reproductive hormone levels. Unlike many varicocele studies, it included men from the general population rather than only men attending fertility clinics.
This was a population-level association. It cannot predict an individual's semen results, and the grade of a varicocele alone does not show what those results will be.
A diagnosis is therefore a reason to understand your options, not a reason to assume there is a fertility problem.
What does a sperm test measure?
A full laboratory semen analysis reports several parameters. The World Health Organization laboratory manual for the examination and processing of human semen, sixth edition, provides reference values used when interpreting results:
| Parameter | WHO sixth-edition lower reference value |
|---|---|
| Sædvolum | 1,4 ml |
| spermkonsentrasjon | 16 millioner per ml |
| Totalt antall spermier | 39 millioner per ejakulat |
| Total motilitet | 42% |
| Progressiv motilitet | 30% |
| Normal morfologi | 4% |
These are reference values, not pass-or-fail thresholds. A result below a reference value does not mean that natural conception is impossible, while results within the expected ranges do not guarantee conception or rule out every fertility factor. Our guide to what a semen analysis measures explains each parameter in more detail.
Research most often links varicocele with changes in sperm concentration and motility. Total motile sperm count combines semen volume, sperm concentration and motility, making it a useful parameter to review alongside the individual measurements.
What are the sperm-testing options in the UK?
Through the NHS. Your GP can discuss your symptoms and fertility history and may arrange or refer you for a semen analysis. The NHS generally advises seeking help after one year of regular unprotected sex without pregnancy, or sooner in some circumstances. Referral routes and waiting times vary locally.
Through a private clinic. A private clinic may provide faster access without an NHS referral. Samples may need to be produced on site or delivered within a specified time. Ask which parameters are included, what preparation is required and how the results will be explained.
At home. An at-home test can provide a private first look at selected semen parameters without sending a sample away. It cannot diagnose a varicocele, prove that a varicocele caused a particular result or replace a physical examination and full clinical assessment.
The ExSeed Home Sperm Test measures semen volume, sperm concentration and progressive motility, and calculates total motile sperm count. It allows you to repeat testing under comparable conditions and track results over time.
Why can one result be misleading?
Semen parameters naturally vary between samples from the same person. Recent illness or fever, the abstinence period and collection conditions can all influence a result. One lower result is one data point, not a complete fertility diagnosis.
If a clinical semen analysis is outside the expected range, NICE guidance recommends a repeat confirmatory analysis, ideally around three months later. A clinician may recommend earlier reassessment when a severe sperm deficiency is identified.
If you are using a home test to build a baseline or track change, follow the product instructions and keep preparation and collection conditions as consistent as possible. Speak to a healthcare professional if results remain concerning or you have symptoms or relevant medical history.
Why do changes take around three months?
Sperm production and maturation take about three months. That means the full effect of a health change or treatment may not be visible in a test taken only a few weeks later.
The right timing after varicocele treatment depends on the procedure and your specialist's follow-up plan. Long-term follow-up research published in Andrology assessed semen parameters at 6, 12, 18 and 24 months after varicocelectomy, illustrating that changes may continue over time.
What does UK guidance say about treatment?
Treatment decisions depend on symptoms, fertility history, examination findings, semen results and local clinical pathways. Not every varicocele needs treatment.
Some NHS referral pathways, including BNSSG's varicocele guidance, advise against routinely referring solely for varicocele surgery as a fertility treatment. Local policies and individual circumstances can differ.
The evidence is mixed. A 2021 Cochrane review of surgical and radiological treatment in subfertile men found that treatment may improve the chance of pregnancy, while the effect on live birth remained uncertain.
Other research has reported improvements in semen parameters after repair. A 2023 systematic review and meta-analysis found improvements in sperm concentration, total count, motility and morphology compared with untreated controls. Better semen parameters and a higher live-birth rate are not the same outcome, which is why specialist interpretation matters.
When treatment is considered, options may include surgery or embolisation. Guy's and St Thomas' explains varicocele embolisation, a minimally invasive procedure that blocks the affected veins using coils or foam.
An article or sperm result cannot tell you whether treatment is right for you. A clinician can consider your symptoms, examination findings, fertility plans and semen results together.
What should you do next?
If you have a diagnosed or suspected varicocele and are trying to conceive, planning a pregnancy or concerned about sperm health, discuss whether a semen assessment is appropriate. A result within the expected range can be reassuring for the parameters measured, but it does not rule out every fertility factor. A lower result can provide a useful starting point for a clinical conversation and appropriate follow-up.
A home sperm test can offer selected information, but it cannot diagnose the cause of an unexpected result. Read our guide to urology and male fertility to understand when to begin with your GP and when specialist assessment may be appropriate.
Seek urgent medical help for sudden, severe testicular pain. Do not wait for a sperm test or fertility appointment.
Ofte stilte spørsmål
Påvirker en varicocele alltid fruktbarheten?
No. Most men with a varicocele are not infertile. Research links varicocele with lower semen quality on average, but it cannot predict an individual's fertility. A semen test can show whether relevant parameters are within expected ranges; it cannot prove that a varicocele caused the result.
Kan jeg teste for varicocele hjemme?
No. A healthcare professional diagnoses a varicocele through medical history and physical examination, with ultrasound used in some circumstances. A home sperm test can measure selected semen parameters, but it cannot diagnose a varicocele.
How long after varicocele treatment should I repeat a sperm test?
Sperm production and maturation take about three months, so a test performed only a few weeks after treatment may be too early to show the full effect. Follow the timing recommended by your urologist or fertility specialist.
Will the NHS treat a varicocele to improve fertility?
Not routinely in every case. NHS referral and commissioning policies vary, and the evidence for fertility outcomes is mixed. Treatment may be considered for persistent symptoms or selected fertility cases after specialist assessment.
Can a varicocele affect testosterone?
Varicocele has been associated with altered reproductive hormone levels in some studies, but this does not mean every man with a varicocele has low testosterone. A semen analysis does not measure hormones. Testosterone concerns require a separate clinical assessment and blood testing. See our guide to low testosterone in men.
What sperm-test result is considered normal?
WHO reference values include a sperm concentration of 16 million per ml, total motility of 42%, progressive motility of 30%, normal morphology of 4% and semen volume of 1.4 ml. These are population reference points, not a pass-or-fail threshold or a guarantee of fertility.
This article provides general information and is not a substitute for individual medical advice, diagnosis or treatment.
