At-Home Sperm DNA Fragmentation Testing
A normal semen analysis is not always a complete one. DNA fragmentation testing evaluates damage to sperm’s genetic material, adding context when semen parameters look normal but questions remain.
Processed in a CLIA-certified, CAP-accredited high-complexity andrology laboratory. Results are available within 24 hours of lab receipt, with MateIQ, an AI report interpretation tool, included.
What is Sperm DNA Fragmentation?
A conventional semen analysis measures parameters such as sperm concentration, motility, and morphology, but it does not measure the integrity of the DNA they carry. DNA fragmentation testing evaluates that separate dimension of sperm quality, providing information that conventional semen parameters do not capture.
Sperm carry genetic material that combines with the egg at fertilization. Understanding genetic integrity helps identify factors not captured by a standard semen analysis that can affect reproductive outcomes.
Sperm DNA is normally protected by tight packaging, but oxidative stress, varicocele, febrile illness, smoking, environmental exposures, and increasing paternal age can contribute to damage.
Egg can repair some sperm DNA damage after fertilization. When damage is more extensive, it may affect fertilization, embryo development, and pregnancy outcomes.
The DFI reports the percentage of sperm with fragmented DNA. It measures a separate dimension of sperm quality that core semen parameters such as concentration, motility, and morphology do not capture.
A normal semen analysis is not always a complete one
Conventional semen analysis provides important information, but it may not tell the complete story.
A man can have normal sperm concentration, motility, and morphology while still carrying a high proportion of sperm with fragmented DNA. Because a Comprehensive Semen Analysis does not assess DNA integrity, DFI testing may add context when semen parameters look normal but questions about fertility remain.
This is one reason DNA fragmentation testing may provide additional information when conventional semen parameters appear normal but infertility remains unexplained.
of men with unexplained infertility and a normal semen analysis may have elevated DNA fragmentation.
Source: Esteves et al., Andrologia, 2021What factors are associated with elevated DNA fragmentation?
Elevated sperm DNA fragmentation may be associated with several contributing factors.Some are things you may be able to change, some a physician may be able to treat, and some are outside anyone's control. Some potentially modifiable factors may improve over time.
May be able to change
- Smoking
- Excess weight
- Heat exposure, such as hot tubs and saunas
- A recent high fever
- Certain medications and recreational drugs
- Environmental chemicals and air pollution
- Long intervals between ejaculations
A physician may be able to treat
- A varicocele, one of the best-documented contributors to oxidative stress in the testicle
- Infection or inflammation in the reproductive tract
Cannot be changed
- Increasing paternal age
What medical guidelines say about sperm DNA fragmentation testing
Medical guidelines recognize a role for sperm DNA fragmentation testing in specific clinical situations, including recurrent pregnancy loss. Because DFI measures sperm DNA integrity, which conventional semen analysis does not capture, some patients also choose to include it earlier for additional information.
Recurrent Pregnancy Loss
Updated ASRM guidance states that sperm DNA fragmentation testing may be considered in otherwise unexplained recurrent miscarriage or recurrent miscarriage with concomitant infertility.
Read the 2026 ASRM Recurrent Pregnancy Loss Committee Opinion →Male Infertility Evaluation
The joint guideline recommends evaluation of the male partner with karyotype and sperm DNA fragmentation testing in couples experiencing recurrent pregnancy loss.
Read the AUA/ASRM Male Infertility Guideline →
Which DNA Fragmentation test is right for you?
The Halo method made visible.
Mate Health measures sperm DNA fragmentation using the Sperm Chromatin Dispersion (SCD) method. SCD evaluates how sperm chromatin disperses after processing and examination under microscopy.
Sperm with intact DNA produce medium or large halos of dispersed chromatin around the sperm head. When DNA is fragmented, the halo is smaller or absent. The five-category classification follows the original SCD test described by Fernández et al. (Journal of Andrology, 2003), performed using the improved SCD method (Fernández et al., Fertility and Sterility, 2005).
Five SCD halo categories
Each evaluated sperm is classified into one of five categories by halo size. Click on any micrograph to inspect it in detail with its description.
How DFI is calculated
At least 200 sperm are evaluated and classified to calculate the DNA Fragmentation Index (DFI).
Large Halo and Medium Halo sperm are classified as nonfragmented. Small Halo, No Halo, and No Halo Degraded sperm are classified as fragmented and are included in the DFI calculation.
Interpreting DFI
Mate Health's laboratory uses a DFI reference threshold of below 30% for its SCD assay.
DNA fragmentation thresholds can vary by testing method and laboratory, so DFI results should be interpreted according to the method used and alongside semen analysis findings and the broader fertility evaluation.
Frequently Asked Questions
Find answers to common questions about our products, services, and policies.
Frequently Asked Questions
Can I test sperm DNA fragmentation at home?
Yes. Mate Health offers at-home sperm DNA fragmentation testing as a standalone test for patients who have already completed a semen analysis, or as part of the Advanced Semen Analysis with DNA fragmentation and vitality. Specimens are collected at home and shipped with Active Cooling to a CLIA-certified, CAP-accredited high-complexity andrology laboratory.
Results are available within 24 hours of lab receipt.
What is a normal DFI?
DFI is reported as the percentage of sperm with fragmented DNA. Mate Health's laboratory reports DFI against a reference range of below 30%, consistent with commonly cited thresholds for the SCD method. Interpretation thresholds vary across the medical literature, so your result should be considered in the context of your broader fertility evaluation. MateIQ helps explain your specific result and prepare questions to review with your physician.
Does a normal semen analysis rule out DNA fragmentation?
No. Standard semen analysis does not measure DNA fragmentation.
A man can have normal sperm concentration, motility, and morphology while still having elevated DNA fragmentation. Research has found elevated sperm DNA fragmentation in up to 20% of men with unexplained infertility despite otherwise normal conventional semen parameters.
Do medical guidelines recommend DNA fragmentation testing?
Yes, in certain clinical situations.
The AUA/ASRM male infertility guideline recommends sperm DNA fragmentation evaluation of the male partner in couples with recurrent pregnancy loss. ASRM’s 2026 recurrent pregnancy loss guidance also states that sperm DNA fragmentation testing may be considered in otherwise unexplained recurrent miscarriage or recurrent miscarriage with concomitant infertility.
DNA fragmentation measures information that is not captured by a standard semen analysis. Some couples also elect to include DFI from the beginning as part of a more comprehensive semen evaluation. Results should be interpreted in the context of the individual couple and their clinical situation.
Can DNA fragmentation be improved?
Some factors associated with elevated sperm DNA fragmentation, including smoking, varicocele, febrile illness, and other sources of oxidative stress, may be modifiable or treatable.
Because sperm development occurs over roughly three months, a physician may recommend addressing contributing factors and repeating testing to determine whether DFI has changed.
Research is still needed to determine whether interventions that lower sperm DNA fragmentation improve pregnancy outcomes.