Semen analysis: what it measures, what it skips, when it matters
Semen analysis is the most important single test in male fertility workup. What WHO 2021 measures, the one parameter almost no clinic includes — and when the test is actually due.
What to remember before reading on.
- 1A semen analysis (Spermiogramm) measures four headline parameters by default: concentration, motility, morphology, and volume. WHO 2021 reference values are the current standard.
- 2DNA fragmentation (DFI) is almost never included in standard semen analysis — yet it is the strongest single predictor of embryo quality and miscarriage risk, independent of count and motility.
- 3A private German lab semen analysis typically costs €80–180. Turnaround: 1–2 weeks.
- 4Indicated for: 12 months of trying without conception (6 months if partner > 35), before TRT, before chemotherapy, age 40+ with future fertility plans.
What a semen analysis actually measures
A semen analysis — the German term Spermiogramm is widely used, and the rest of the literature calls it semen analysis — is the most direct measurement of male reproductive output. A hormone panel tells you whether the signal to make sperm is intact; the semen analysis tells you what is actually being produced.
The standard test measures four headline parameters plus two helpers:
| Parameter | WHO 2021 reference (lower bound) | What it tells you |
|---|---|---|
| Concentration | ≥ 16 M/mL | Sperm per millilitre |
| Total count | ≥ 39 M per ejaculate | Total output per sample |
| Total motility | ≥ 42% | Proportion of motile sperm |
| Progressive motility | ≥ 30% | Proportion moving with direction |
| Morphology (Kruger) | ≥ 4% | Normal forms, strict criteria |
| Volume | ≥ 1.4 mL | Ejaculate volume |
WHO 2021 (the 6th edition lab manual) sets these as population-based 5th-percentile lower bounds — they are not clinical treatment thresholds. A man with concentration 14 M/mL is not automatically infertile; he is below the lower reference and should repeat the test and read it alongside his hormone panel.
What the standard test skips
The biggest practical gap: DNA fragmentation, often expressed as DFI (DNA Fragmentation Index).
DFI measures the proportion of sperm with broken DNA strands. The index correlates with embryo quality, fertilisation rates, and miscarriage risk — independent of count and motility. A man can have a "normal" semen analysis and a pathological DFI at the same time.
Three situations where DFI matters most:
- Unexplained infertility. Standard parameters look fine, pregnancy doesn't happen. DFI explains a substantial share of those cases.
- Recurrent miscarriage. High DFI is associated with elevated miscarriage risk, even when the female partner's parameters are normal.
- Advanced paternal age. DFI roughly doubles between age 25 and 55. Past 40 with future fertility plans, the value is worth knowing.
DFI requires its own assay (TUNEL, SCSA, Halo, Comet) and is not available in every andrology lab. At specialist clinics it adds €60–150 to the standard test.
When the test is actually due
Five clear indications:
1. Trying to conceive without success. ESHRE and AUA both put the threshold at 12 months of regular intercourse without pregnancy (6 months if the partner is > 35). Semen analysis is the lead test on the male side.
2. Before TRT or anabolic steroids. TRT suppresses sperm production within weeks. A pre-TRT baseline documents what you are about to lose — combined with cryopreservation, the most useful pre-TRT step if children are still on the roadmap.
3. Before chemotherapy or radiation. Cytotoxic treatment can permanently impair spermatogenesis. Semen analysis plus cryopreservation pre-treatment is established standard of care; German clinics already offer it.
4. After an intervention. Varicocele repair, treatment of a hormonal cause, significant lifestyle change — all warrant a follow-up semen analysis at least one full spermatogenesis cycle (~90 days) later.
5. Past 40 with future fertility plans. Sperm parameters and DNA integrity decline. Knowing your current numbers — particularly DFI — informs how aggressively to act.
Semen analysis vs. hormone panel — which first?
If you can't do both in parallel: hormone panel first. Three reasons:
- Hormones screen for upstream causes. Hyperprolactinaemia, secondary hypogonadism, and severe energy deficit are treatable causes that a semen analysis won't show — but that may explain abnormalities a semen analysis would later flag.
- Faster and cheaper. €89 in 3–5 working days vs. €80–180 in 1–2 weeks.
- Less logistics. No abstinence-window management, no one-hour transport to a lab.
If the hormone panel is clean and the question is conception: then the semen analysis.
What at-home testing is going to change
Standard semen analysis requires sample collection in or near the clinic and transport within an hour. That isn't strictly necessary — modern stabiliser kits with overnight courier transport enable clinically valid at-home collection.
FutureKit is building exactly that for Q4 2026: at-home sperm analysis including DNA fragmentation, overnight courier to a German andrology lab, physician-reviewed report in 2–4 days. Waitlist here.
What you can do today
If "semen analysis: yes or no?" is on your mind:
- 30-second check: three questions, one clear recommendation. /quick-check.
- Acute indication (TTC, pre-TRT, age 40+): andrology clinic. Semen analysis + DFI add-on if available.
- Hormone side in parallel: Hormone Panel 01 covers the six most relevant markers, €89, physician-reviewed in 3–5 days.
A standard semen analysis is the most direct measurement — paired with a hormone panel, the workup is more complete than either test alone.
Sources cited: WHO 2021 laboratory manual (6th ed.), Agarwal et al. 2019 (DFI as predictor) — full entries on /science.