Senior Consultant, Medical Genetics, Artemis Hospitals, Gurgaon, India
Part 8 of 12 in Finding Answers in Recurrent Pregnancy Loss
Sperm DNA Fragmentation: The Male Factor in Recurrent Pregnancy Loss
June 7, 2026
Sperm DNA fragmentation is an emerging area with conditional approval from both ASRM and ESHRE guidelines: not dismissed as non-beneficial, but not yet routine either. The theory: excessive DNA damage in sperm can impair embryo quality, halt blastocyst development, and raise miscarriage risk. The sperm DNA fragmentation index test flags anything above 30% as a high level of damage.
The causes are usually multifactorial: oxidative stress, varicocele, other infections, smoking, obesity, and advanced paternal age all contribute. Men with elevated fragmentation should be referred for a urology evaluation alongside addressing modifiable lifestyle factors. Dr. Singh notes that above age 50 specifically, sperm quality and DNA fragmentation are frequently impaired even without formal testing, making the test worthwhile in men over 50 with a history of recurrent loss or implantation failure.
This guide is based on a live Jivo Masterclass — Dr. Kanika Singh taught doctors across Africa on June 7, 2026.
FROM THE LIVE Q&A
Dr. Agbogus Stanley
For patients with PCOS, how long should metformin be taken before conception and after conception?
Dr. Kanika Singh
Metformin should be started at least 2 to 3 months before conception. It is safe to continue in pregnancy and is generally continued through the first trimester and sometimes beyond. It should be monitored with GTT as well as regular HbA1c and blood sugar checks throughout.
Frequently Asked Questions
My question is about sperm collection. In my clinic I often see couples where the male is over 50 years old. What are the chances of getting good quality sperm, and what are the implications for implantation?▼
I will not be able to give you details about specific sperm selection procedures, as in our hospital this is a multidisciplinary process involving the IVF specialist and the andrology laboratory. But in terms of the genetic implications: above the age of 50, there is a high chance that sperm quality is reduced, and the sperm DNA fragmentation index is likely to be elevated. Unless we specifically test for it, we do not know the exact level, but even without testing, there is a significant chance that sperm DNA quality is impaired, which can result in recurrent pregnancy loss or implantation failure. Testing the sperm DNA fragmentation index in men above 50 with a history of recurrent pregnancy loss or implantation failure would be worthwhile.
For patients with PCOS, how long should metformin be taken before conception and after conception?▼
Metformin should be started at least 2 to 3 months before conception. It is safe to continue in pregnancy and is generally continued through the first trimester and sometimes beyond. It should be monitored with GTT as well as regular HbA1c and blood sugar checks throughout.
What sperm DNA fragmentation index result indicates high damage?▼
The sperm DNA fragmentation index test flags anything above 30% as a high level of damage.
What causes elevated sperm DNA fragmentation?▼
The causes are usually multifactorial: oxidative stress, varicocele, other infections, smoking, obesity, and advanced paternal age all contribute.
How can sperm DNA fragmentation affect pregnancy outcomes?▼
Excessive DNA damage in sperm can impair embryo quality, halt blastocyst development, and raise miscarriage risk.
What should be done for men found to have elevated sperm DNA fragmentation?▼
They should be referred for a urology evaluation alongside addressing modifiable lifestyle factors.
Is sperm DNA fragmentation testing part of routine fertility guidelines?▼
It carries conditional approval from both ASRM and ESHRE guidelines: not dismissed as non-beneficial, but not yet routine either.
In This Series: Finding Answers in Recurrent Pregnancy Loss
- 1.Finding Answers in Recurrent Pregnancy Loss
- 2.Fetal Chromosomal Abnormalities: The Leading Cause of First-Trimester Loss
- 3.Balanced Translocation: When a Genetically Normal Parent Passes on Recurrent Loss
- 4.Single-Gene Causes: Why Second-Trimester Losses Need a Different Genetic Workup
- 5.Anatomical Causes: Uterine Septum, Fibroids, and Cervical Incompetence
- 6.Antiphospholipid Antibody Syndrome: Diagnosis and Treatment
- 7.Endocrine Causes: Thyroid, PCOS, and Diabetes in Recurrent Pregnancy Loss
- 8.Sperm DNA Fragmentation: The Male Factor in Recurrent Pregnancy Loss
- 9.The Immunological Debate: NK Cells, TNF-Alpha, and IVIG Therapy
- 10.What to Test For: A Practical Investigation Framework by Trimester
- 11.Pre-Implantation Genetic Testing: PGT-A, PGT-M, PGT-SR and PGT-HLA Explained
- 12.Prognosis After Recurrent Pregnancy Loss: Why the Outlook Is Better Than Most Couples Expect