How to Read Your Semen Analysis Results
By Dr. Demián Glujovsky, Reproductive Medicine Specialist
A semen analysis report is one of the most information-dense documents a couple or individual pursuing conception will receive — and one of the least clearly explained. The results arrive with numbers, percentages, and Latin-derived clinical terms that are rarely decoded in the brief appointment that follows. In my years as a reproductive medicine specialist, I have watched countless couples leave a clinic more anxious than when they arrived, simply because nobody took the time to translate the numbers into practical meaning. This guide does exactly that.
We will cover every standard parameter on a WHO 2021-compliant semen analysis, explain what "normal" means, and — crucially — help you understand which values affect your options for at-home ICI versus clinic-based IUI or IVF.
Why the WHO 2021 Reference Values Matter
The World Health Organization publishes reference values for semen parameters based on studies of fertile men — men who fathered a pregnancy within 12 months of unprotected intercourse. These are the fifth percentile values from that population. This means that a result "at" the reference value is at the lower end of the fertile range, not the ideal. The 2021 update (the sixth edition of the WHO laboratory manual) revised several values downward compared to 2010, reflecting larger and more diverse study populations.
These reference values are widely used by andrology laboratories and reproductive clinics worldwide. They do not tell you whether you will or won't conceive — they describe statistical likelihood relative to a fertile population.
Parameter by Parameter: What Each Number Means
1. Semen Volume
WHO 2021 reference: ≥ 1.4 mL
This is the total amount of fluid produced in one ejaculate. Low volume (hypospermia) can dilute sperm count or indicate issues with the seminal vesicles or prostate. Very high volume (above 6 mL) can also reduce sperm concentration. For practical purposes, volume matters most when it is so low (under 0.5 mL) that total sperm numbers are affected. Most standard syringe kits, including MakeAmom's, are sized to accommodate the typical volume range of 2–5 mL.
2. Sperm Concentration
WHO 2021 reference: ≥ 16 million sperm per mL
Sperm concentration is the number of sperm cells in each milliliter of semen. This is distinct from total sperm count (concentration × volume). A reading below 16 million/mL is defined as oligospermia. Mild oligospermia (10–15 million/mL) may have little impact on ICI success rates; moderate (5–10 million/mL) or severe (below 5 million/mL) oligospermia significantly reduces per-cycle pregnancy rates with ICI and is usually a reason to consider IUI or beyond.
3. Total Sperm Count
WHO 2021 reference: ≥ 39 million per ejaculate
Total count is concentration multiplied by volume. A person with a low concentration but high volume may have an acceptable total count. Conversely, a low-volume, low-concentration sample may have very few total sperm. Total count is often the more clinically meaningful number than concentration alone.
4. Total Motility
WHO 2021 reference: ≥ 42%
Motility refers to the percentage of sperm that are moving. Total motility includes all moving sperm regardless of direction or speed. Asthenozoospermia (low motility) is one of the most common semen abnormalities. For at-home ICI, the MakeAmom Impregnator kit is specifically designed to compensate for lower motility by using a cervical cap mechanism that concentrates sperm at the cervical os, allowing passive diffusion rather than requiring the sperm to swim the full distance.
5. Progressive Motility
WHO 2021 reference: ≥ 30%
Progressive motility counts only sperm moving in a straight line or large circles — the directional movement needed to navigate the cervix and fallopian tubes. It is the most functionally relevant motility parameter. A progressive motility below 20% alongside normal concentration may still permit ICI success; below 10% it significantly diminishes ICI efficacy and IUI is typically recommended.
6. Morphology (Normal Forms)
WHO 2021 reference: ≥ 4% normal forms (Kruger strict criteria)
Morphology assesses the percentage of sperm with a "normal" shape — an oval head, mid-piece, and tail of correct proportions. The Kruger strict criteria, used by most accredited labs, are demanding: only sperm that meet precise geometric standards are counted as normal. This means that 96% abnormal forms is the expected baseline in a fertile man's sample. Isolated low morphology (teratozoospermia) with normal count and motility rarely prevents conception via ICI. Very severe teratozoospermia (below 1–2%) may warrant ICSI.
7. pH
WHO 2021 reference: ≥ 7.2
Semen pH reflects the alkalinity of the ejaculate, which protects sperm from the acidic environment of the vagina. Acidic semen (pH below 7.0) may indicate obstruction of the seminal vesicles or infection. Highly alkaline semen can also be abnormal. pH is typically noted on the report but rarely requires specific treatment unless combined with other abnormalities.
8. Liquefaction Time
Reference: Complete within 60 minutes (typically 5–30 minutes)
Freshly ejaculated semen is semi-solid and must liquefy before sperm can swim freely. Prolonged liquefaction (more than 60 minutes) can impair sperm transport and affect ICI results. If using fresh sperm for at-home insemination, always allow the sample to liquefy for at least 20 minutes in the collection cup before drawing it into the syringe.
9. Vitality (Viability)
WHO 2021 reference: ≥ 54% live sperm
Vitality measures the percentage of sperm that are alive, irrespective of whether they are moving. Non-motile sperm may be alive (immotile but viable) or dead. High immotility with high vitality may suggest structural sperm tail defects (e.g., primary ciliary dyskinesia). Very low vitality alongside low motility (necrozoospermia) may indicate oxidative stress and often responds to antioxidant supplementation.
10. White Blood Cells (Leukocytospermia)
Reference: Below 1 million/mL
Elevated white blood cells in semen indicate inflammation or infection (leukocytospermia). This can be caused by sexually transmitted infections, urinary tract infections, or prostatitis. It generates reactive oxygen species (free radicals) that directly damage sperm DNA and reduce motility. If your report shows elevated leukocytes, a urological evaluation is warranted before proceeding with insemination.
Quick-Reference Table: WHO 2021 Reference Values
| Parameter | WHO 2021 Lower Reference | Clinical Note |
|---|---|---|
| Volume | ≥ 1.4 mL | Below 0.5 mL: hypospermia |
| Concentration | ≥ 16 million/mL | Below 5 million/mL: severe oligospermia |
| Total sperm count | ≥ 39 million/ejaculate | Zero: azoospermia |
| Total motility | ≥ 42% | Below 40%: asthenozoospermia |
| Progressive motility | ≥ 30% | Below 20%: consider IUI |
| Morphology (strict) | ≥ 4% normal forms | Below 4%: teratozoospermia |
| Vitality | ≥ 54% live | Below 54%: check for necrozoospermia |
| pH | ≥ 7.2 | Below 7.0: possible obstruction |
| Leukocytes | < 1 million/mL | Above 1 million/mL: investigate infection |
| Liquefaction | Within 60 min | Delay impacts sperm transport |
How Results Affect ICI vs IUI Decision
Not all semen analysis results are equal when it comes to choosing your insemination approach. Here is a practical framework based on the most commonly encountered scenarios:
- Total motility ≥ 30% and progressive motility ≥ 20%
- Total sperm count ≥ 20 million per ejaculate
- Morphology ≥ 2% (even below WHO reference, ICI can still work with good motility)
- No leukocytospermia or active infection
- Progressive motility below 15–20%
- Total count below 10–15 million per ejaculate
- Severe oligospermia (concentration below 5 million/mL)
- 3–6 ICI cycles with confirmed ovulation have not resulted in pregnancy
- Combination of two or more abnormal parameters
Kit Selection Based on Semen Parameters
If you are pursuing at-home ICI and have specific semen analysis findings, kit selection matters:
- Low motility (asthenozoospermia): The Impregnator kit uses a cervical cap design that holds sperm in contact with the cervical opening, compensating for reduced swimming ability.
- Frozen donor sperm (lower volume, lower motility post-thaw): The CryoBaby kit is sized for smaller-volume frozen vials and optimizes retention of the thawed sample.
- Normal parameters, comfort-focused: The BabyMaker kit is designed for standard fresh sperm use with a focus on soft, smooth silicone comfort.
How to Improve Semen Parameters
Semen parameters are not fixed. Sperm take approximately 72–90 days to mature (spermatogenesis), meaning that lifestyle changes made today will begin to show effects in the analysis done 3 months from now. Evidence-backed approaches include:
Antioxidants
Oxidative stress is one of the most modifiable causes of poor sperm quality. Supplementation with CoQ10 (200–600 mg/day), vitamin C, vitamin E, zinc, selenium, and l-carnitine has demonstrated improvements in motility and DNA integrity in multiple randomized controlled trials. See our guide to antioxidants and fertility for a detailed breakdown.
Lifestyle Factors
- Heat avoidance: Tight underwear, hot baths, prolonged laptop use on the lap, and sauna use all raise scrotal temperature, impairing sperm production. Switching to loose-fitting boxers can produce measurable improvements within 3 months.
- Alcohol and smoking: Both are independently associated with reduced sperm count, motility, and morphology. Reducing or eliminating both is one of the highest-impact changes available.
- Abstinence interval: The optimal abstinence interval before semen analysis (and insemination) is 2–5 days. Very short intervals (under 24 hours) reduce volume and total count; longer intervals (over 7 days) increase sperm age and DNA fragmentation.
- Steroid and recreational drug use: Anabolic steroids drastically suppress sperm production — often causing azoospermia — and can take 12–24 months to recover from after cessation.
When to See a Specialist
One abnormal semen analysis is not a definitive diagnosis. Laboratory variability, illness in the preceding 3 months, and collection technique all affect results. A second analysis is standard before making treatment decisions. If two analyses show consistently abnormal parameters — particularly azoospermia, severe oligospermia, or leukocytospermia — referral to a urologist or andrologist is appropriate. Many causes of male-factor subfertility are treatable.
The American Society for Reproductive Medicine and the WHO Laboratory Manual (6th ed., 2021) are the authoritative references for semen analysis interpretation.
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