Double‑Strand Sperm DNA Fragmentation Test
For many couples, the journey to parenthood is emotionally and physically demanding. When miscarriage, failed IVF or uncertain results arise, finding answers can feel urgent. Although standard sperm analysis assesses number, shape and movement, it does not show what’s happening inside the DNA of the sperm itself. A sperm fragmentation test offers deeper insight into sperm quality, identifying genetic damage that could affect embryo development and pregnancy success.
The Forbury Clinic offers advanced assessment with the Extend® Double‑Strand Sperm DNA Fragmentation Test, provided in partnership with Examen, leaders in male fertility diagnostics. This specialist test measures the most significant form of sperm DNA damage – double‑strand breaks – helping to explain recurrent miscarriage, failed fertility treatments or unexplained infertility.
What Is a Double‑Strand Sperm DNA Fragmentation Test?
A sperm fragmentation test analyses sperm DNA integrity to detect damage that could impact embryo quality or implantation. Double‑strand DNA fragmentation (dsSDF) occurs when both strands of the DNA helix break at the same point (the genetic equivalent of a snapped ladder). Because this form of damage is difficult for the body to repair, it can contribute to poor embryo development and a higher risk of miscarriage.
The Extend® test focuses specifically on these double‑strand breaks, giving a clearer picture of sperm health and providing insight that conventional DNA tests or semen analysis cannot achieve.
Why Double‑Strand DNA Matters for Fertility
Healthy sperm DNA is vital for normal fertilisation and embryo growth. When DNA is fragmented, the embryo may stop developing or fail to implant, even when the sperm count and motility appear normal. Research shows that double‑strand DNA breaks are particularly linked with:
- Recurrent miscarriage in early pregnancy
- Failed IVF or ICSI cycles despite seemingly normal results
- Unexplained infertility where all other tests appear clear
By pinpointing this deeper level of DNA damage, the Extend® test allows fertility specialists to target treatment, adjust procedures such as ICSI, or recommend further investigation to improve outcomes.
How the Extend® Test Works
The Extend® Double‑Strand Sperm DNA Fragmentation Test uses advanced laboratory technology validated by Examen for use with both ejaculated and surgically retrieved sperm, even when sample numbers are low (oligozoospermic samples). The method isolates sperm cells and directly measures the extent of double‑strand DNA breaks with exceptional precision.
Unlike general sperm DNA tests that estimate overall damage, Extend® exclusively quantifies the severe double‑strand breaks that have the strongest link with reduced fertility and pregnancy loss. The results offer meaningful, actionable insight to guide fertility decision‑making.
Who Should Consider the Extend® Test?
You may benefit from this advanced sperm fragmentation test if you:
Have experienced repeated early miscarriages
Are preparing for IVF or ICSI and wish to optimise success rates
Have had failed fertility treatments with no clear explanation
Are considering surgical sperm retrieval (SSR) and need to assess sperm DNA quality
Improving Fertility Treatment Outcomes
Understanding double‑strand DNA damage can help refine treatment strategies. Fertility specialists can tailor approaches such as antioxidant therapy, lifestyle interventions, or advanced sperm selection methods (including microfluidic sperm selection) to select healthier sperm and enhance the chances of successful pregnancy.
What to Expect During Your Appointment
Initial Consultation
Your appointment begins with a discussion with a urologist about your fertility history, any previous investigations, and recent treatments such as IVF or ICSI. The consultant explains the importance of sperm DNA integrity and how the Extend® test may inform next steps.
Sample Collection and Laboratory Analysis
The test requires a semen sample, which is processed at Examen’s ISO‑accredited laboratory. Using their validated testing process, the laboratory measures double‑strand breaks and produces a detailed report for clinical interpretation.
Results and Support
Once ready, your clinician explains the findings, relating your double‑strand fragmentation level to fertility outcomes. Depending on results, recommendations might include medical therapy, lifestyle adjustments or a refined fertility plan.
Sperm Fragmentation Test FAQs
- How is a sperm fragmentation test different from a semen analysis?
A semen analysis measures sperm count, motility and appearance. A sperm fragmentation test assesses the DNA inside sperm cells, providing crucial information about their genetic quality.
- What causes sperm DNA fragmentation?
Common causes include oxidative stress, smoking, heat exposure, ageing, illness, infection or environmental toxins. DNA damage can vary daily, making assessment an important part of fertility planning.
- Can double‑strand DNA damage be improved?
In some cases, yes. Lifestyle changes such as a balanced diet, reducing alcohol, stopping smoking and taking antioxidant supplements can help reduce DNA damage. Medical or procedural interventions may also improve sperm selection in IVF.
- Is the Extend® test suitable for all men?
Yes, it is validated for use with both normal and low sperm counts, as well as surgically retrieved samples. It offers detailed insight where other tests may be limited.
Why Choose The Forbury Clinic?
The Forbury Clinic provides consultant‑led male urology and fertility testing with a clear, compassionate approach. Through our partnership with Examen, we offer the Extend® Double‑Strand Sperm DNA Fragmentation Test: the only commercially available test dedicated to measuring double‑strand DNA breaks. Our team delivers clarity, reassurance and a step forward for men and couples seeking answers following unexplained infertility or fertility treatment challenges.