Should I add DNA fragmentation to my semen analysis?

What looking deeper can reveal—and how it can inform your next step

A semen analysis is an important starting point. But if pregnancy is not happening, pregnancies have repeatedly ended in loss, or treatment has been unsuccessful, it is reasonable to ask whether it has answered every relevant question about sperm health.

Sometimes a sperm DNA-fragmentation test can add useful information. The decision should connect three things: what remains unexplained, what the test can tell us, and what a clinician might do differently with the answer.

What does it look at that a semen analysis does not?

A routine semen analysis assesses features such as sperm numbers, movement and shape. DNA-fragmentation testing examines damage to the genetic material carried within sperm. Looking and moving as expected does not establish that every aspect of sperm function is normal. ^{[1] [2]}

The result adds a different layer of information. It is not a complete fertility verdict, a test for every inherited condition, or proof that sperm caused a particular loss. Higher fragmentation is associated with pregnancy loss, but an association cannot identify the cause of an individual person's experience. ^[1]

Why might damage occur—and could anything change?

One possible mechanism is oxidative stress: an imbalance involving reactive molecules that can damage sperm DNA. The assessment may consider contributors such as smoking, relevant exposures, infection or a varicocele—enlarged veins around the testicle. The test does not distinguish these causes by itself. History, examination and targeted investigations are needed to explore them. ^[2]

An abnormal result should therefore start a clinical conversation, not end with a label. Depending on what is actually found, the response could include help to stop smoking, reducing relevant exposures, treatment of a confirmed infection, or specialist assessment of a clinically significant varicocele. These options are not interchangeable treatments for a high number. ^[2]

When is the conversation particularly relevant?

Specialist guidance recognises selected situations. AUA/ASRM guidance supports assessment of sperm DNA fragmentation in recurrent pregnancy loss. ESHRE also conditionally allows consideration for diagnostic purposes in this setting. The purpose is to investigate a possible contribution alongside the rest of the reproductive history, without assigning blame. ^{[1] [3]}

Guidelines do not all agree. NICE NG257 advises against sperm DNA-integrity testing in its fertility pathway. A clinician proposing it should explain that difference, why the test is relevant to your circumstances, and the uncertainty surrounding the response to the result. Private care should be evidence-informed and individualised. ^[4]

What does “actionable” actually mean?

Ask: if the result is raised, what additional assessment or change would be considered? If it is not raised, what would happen next? Is that decision supported by evidence, and would the same sensible action be appropriate without the test?

Possible value includes directing a more focused specialist assessment or informing a treatment discussion. Nobody can promise beforehand that a test will change your outcome. A useful explanation makes the decision it may inform clear.

Nor should a raised result automatically produce a supplement prescription. In the SUMMER randomised trial, the particular antioxidant combination tested did not improve the primary ongoing-pregnancy outcome compared with placebo. Participants were not selected solely for high fragmentation, so the findings do not settle every question about targeted treatment. They do challenge blanket promises that antioxidants improve fertility. ^[5]

Keeping the whole fertility picture in view

Sperm DNA is one part of the Fertility Dance. Ovulation, age, reproductive anatomy, timing and other relevant factors still need consideration. A result should sit within a coordinated plan, with an appropriate review point and a clear explanation of what remains uncertain.

ProFertility's approach is to investigate meaningful questions, look for potentially modifiable barriers and connect findings with proportionate action. That can include looking beyond a routine semen analysis when there is a sound clinical reason. It also means explaining when another investigation is unlikely to add useful direction.

Read our Complete Guide to Sperm DNA Fragmentation for more detail, or speak with a ProFertility specialist about whether deeper assessment fits your history and plans.

Sources

1. AUA/ASRM: Diagnosis and Treatment of Infertility in Men, amended 2024.
2. SFRAG: Best urological practices on testing and management of infertile men with abnormal sperm DNA fragmentation levels, 2021. Expert consensus; evidence limitations apply.
3. ESHRE: Recurrent pregnancy loss guideline, update 2022; published 2023.
4. NICE NG257: Investigation of fertility problems, recommendation 1.17.6; 2026.
5. SUMMER randomised clinical trial, JAMA Network Open, 2025.

Sources checked 15 October 2026. By ProFertility. This article provides education; individual investigations and treatment depend on your circumstances.