Back to the full guide

One-page clinical summary

Sperm DNA Fragmentation: a one-page summary

A printable take-into-the-appointment companion to the full guide at 90daysperm.com/sperm-dna-fragmentation. By Dr. Leila Fazlicic, D.Ac., L.Ac.

What DFI is, in one paragraph

A standard semen analysis measures count, motility, and morphology. The DNA Fragmentation Index (DFI) measures the integrity of the genetic material inside each sperm cell. Men can have a normal semen analysis and still have elevated DFI — which is associated with longer time to pregnancy, lower IVF success, and higher miscarriage risk.

Key DFI thresholds

  • Above ~20% — general signal of elevated risk: longer time to pregnancy, lower IUI/IVF success, higher pregnancy loss.
  • Above ~30% — particularly high in some cohorts; largest signals for reduced ART outcomes and miscarriage.

Reference ranges depend on the assay (TUNEL, SCSA, SCD/Halosperm, Comet) and lab. Always retest with the same lab and assay so the numbers are comparable.

The 5 non-negotiables

  1. Sleep 7–9 hours nightly with consistent bed and wake times.
  2. Eat Mediterranean-style, anti-inflammatory meals most days; minimize ultra-processed foods, refined carbs, and trans fats.
  3. Move moderately 3–5×/week (~150 minutes total) plus 2–3 resistance sessions; avoid chronic endurance overtraining.
  4. Keep the testes cool — no hot tubs or long saunas, no laptop on the lap, loose underwear, movement breaks every 60–90 minutes.
  5. Limit sperm-toxic substances — eliminate tobacco/nicotine and cannabis; cap alcohol at no more than ~5 drinks per week.

When to consider a DFI test

  • Normal semen analysis but pregnancy isn't happening
  • Unexplained infertility
  • Recurrent miscarriage or pregnancy loss
  • Failed IVF or ICSI cycle — especially with otherwise good embryo development
  • Known varicocele
  • Advanced paternal age (late thirties and beyond)
  • Stacked lifestyle / environmental risks (smoking, heat, chemical exposure, obesity)

DFI is not a routine first-line test. It is ordered by a reproductive urologist or REI and interpreted alongside the female workup, age, history, and ART plan.

Supplements — evidence-based doses

Discuss with your clinician before starting. Take fat-soluble supplements with a fat-containing meal. Don't take zinc and iron at the same time.

  • CoQ10 — 200–300 mg/day
  • Vitamin C — 500–1,000 mg/day
  • Vitamin E — supportive antioxidant
  • Zinc — 15–30 mg/day
  • Omega-3 (EPA/DHA) — 1–2 g/day

The 90-day window

Sperm production takes ~74 days plus ~2 weeks of epididymal maturation. Today's habits show up in the sperm released in roughly 2–3 months. Retest at day 60–90 with the same lab and assay; read the trend, not a single number.