Diagnostic Test
Genetic Testing
A simple blood test checking for hidden genetic factors that cause severe sperm shortages.
Key Takeaways
- A simple blood test checking for hidden genetic factors that cause severe sperm shortages.
- We offer specialist interpretation and related treatments. Book a consultation to discuss your options.
Overview
About Genetic Testing
Genetic testing for male fertility is an advanced blood test that checks your DNA for specific genetic traits or changes that can directly affect your body's ability to produce healthy sperm.
While standard fertility evaluations check your lifestyle and hormone levels, genetic testing looks deeper at the structural blueprint of your body. In the UK, it typically checks for three key genetic factors:
Karyotype abnormalities: Checking the overall number and shape of your chromosomes (such as looking for an extra X chromosome, commonly known as Klinefelter syndrome).
Y-chromosome microdeletions (YCMD): Screening for tiny missing pieces of genetic information on the male (Y) chromosome that are vital for making sperm.
Cystic Fibrosis (CFTR) gene mutations: Looking for gene changes that can occasionally cause the tubes that carry sperm from the testicles to be missing from birth.
Test Information
Understanding Your Test
A detailed guide to your diagnostic procedure — from essential preparation and the purpose of the test to safety considerations and what to expect during the process.
This evaluation is a routine blood test carried out by a healthcare professional at your local clinic or hospital.
You will sit back comfortably, and a soft, elastic band will be placed around your upper arm to locate a suitable vein. The nurse will gently clean your skin and insert a tiny needle into a vein on the inside of your elbow to collect a standard blood sample. The needle is only in place for a few moments before being removed, and a small plaster will be applied to the area. Because your genetic code remains constant throughout your life, this is a one-time test that does not need to be repeated.
The test is virtually painless and is over in a matter of seconds. You will feel a quick, sharp scratch as the needle enters your vein, followed by a mild pressure as the sample is drawn.
It carries no recovery time, meaning you can get right back to your normal daily activities straight away. If you feel nervous about needles or blood tests, please let the clinical team know; they are highly supportive and will gladly have you lie down during the procedure.
Your doctor or specialist will usually recommend genetic testing if your routine semen analysis shows a severe lack of sperm.
These tests are highly recommended if a man has absolutely no sperm detected in his fluid (azoospermia) or an extremely low sperm count (less than 1 million to 5 million sperm per ml) without an obvious cause. Discovering an underlying genetic link is an important step before considering advanced fertility pathways like IVF, as it helps your healthcare team understand your chances of finding sperm and gives you essential information for planning your future family.
At a glance
Preparation required
- No fasting or special dietary changes are required – you are free to eat, drink, and take your regular medications normally before your appointment.
- Unlike hormone tests, there is no specific time of day required for this test.
- Ensure you are well hydrated, as drinking plenty of water makes it much easier for the nurse to find a vein.
Risks or considerations
- There are no serious physical risks or side effects, other than a potential small, temporary bruise where the needle went in.
- Waiting for results: Because mapping out DNA structure is a highly specialised and technical process, results can take anywhere from a few weeks to a couple of months to be fully completed by the laboratory.
- Emotional support: Discovering a genetic cause for fertility issues can feel overwhelming.
What it can help diagnose
- Klinefelter syndrome: A genetic condition where a male has an extra X chromosome (47XXY), often leading to very low or absent sperm counts.
- Y-chromosome microdeletions: Missing links on the male chromosome that stop or significantly affect sperm production. The known ones are AZFa, AZFb, and AZFc.
- Cystic Fibrosis gene mutations: Clear genetic markers associated with missing sperm tubes (obstructive azoospermia). In these circumstances sperm are usually being made normally, and be used for treatment with IVF and ICSI.
- Underlying genetic factors behind severe or unexplained male infertility.
Our Commitment
Care you can trust
Every test is delivered to the same standard: senior consultants, a personalised plan, and the safety of an accredited private hospital behind you.
Consultant-Led Excellence
Receive evidence-based treatments delivered by senior NHS consultants in a professional, specialist setting.
Personalised Care Plans
Your consultant will design a bespoke treatment plan tailored to your specific health goals and lifestyle.
Hospital-Grade Safety
We operate within leading private hospitals, adhering to strict CQC safety and technology standards.
A Heritage of Trust
Our partners bring decades of NHS and private experience, successfully managing thousands of patient cases.
Trusted Resources
Trusted Patient Resources
Patient Guidance
Frequently Asked Questions
Common questions about this test and what to expect
3 questions
Because the laboratory must carefully grow cells and analyse deep DNA structures, it can take between 4 to 8 weeks for your final report to be returned to your consultant.
Reviewed 31 May 2026
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Not at all. Finding a genetic link simply gives your specialist a clear map. Many men with microdeletions or Klinefelter syndrome can still successfully father children using advanced procedures like Surgical Sperm Retrieval (SSR) combined with IVF.
Reviewed 31 May 2026
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Genetic counselling is a supportive conversation with a specialist who guides you through your test results. They explain clearly how a genetic trait might affect your fertility options and discuss whether it is something that could be passed on to future children, helping you make completely informed choices.
Reviewed 31 May 2026
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