| Parameter | WHO Reference | Ideal Range |
|---|---|---|
| Volume | ≥ 1.5 mL | 2.0–5.0 mL |
| Concentration | ≥ 16 million/mL | 40–300 million/mL |
| Total Count | ≥ 39 million | 80–300 million |
| Total Motility | ≥ 42% | 60–80% |
| Progressive Motility | ≥ 30% | 50–70% |
| Morphology (Strict) | ≥ 4% | 10–15% |
| pH | ≥ 7.2 | 7.2–8.0 |
| Liquefaction | Within 60 min | 15–30 min |
Volume: How Much Is Enough?
Semen volume is the total amount of fluid in a single ejaculation. The WHO considers 1.5 mL the minimum reference value, but typical volumes range from 2-5 mL (roughly half a teaspoon to a full teaspoon).
Low volume can indicate: incomplete collection (the most common cause), retrograde ejaculation (semen going backward into the bladder), ejaculatory duct obstruction, low testosterone, or very recent ejaculation (insufficient time to replenish).
What to do: If volume is low, first confirm with a repeat test. Ensure 2-5 days of abstinence before collection and that the full sample was captured. If persistently low, a urologist can investigate structural causes.
Concentration: The "Count" Everyone Talks About
This is the number of sperm per milliliter of semen. The WHO minimum is 16 million/mL, but fertility specialists generally like to see 40 million/mL or above for natural conception.
Key context: Even men with counts below 16 million can conceive naturally — it just takes longer on average. Concentration interacts with motility: a moderate count with excellent motility can be functionally equivalent to a high count with poor motility.
Sperm counts can vary by 30-40% between samples from the same man. Illness, stress, poor sleep, alcohol, and even the season can affect results. Reproductive urologists typically want at least two analyses, 2-4 weeks apart, before making any clinical decisions.
Motility: Can They Actually Swim?
Motility measures the percentage of sperm that are moving. It's broken into categories: progressive motility (swimming forward in a straight line or large circles), non-progressive motility (moving but not going anywhere useful), and immotile (not moving at all).
Progressive motility is what matters most. These are the sperm that can actually reach the egg. The WHO minimum is 30% progressive motility, but most fertility specialists consider 50%+ to be the comfort zone.
What helps motility: CoQ10 is the most studied supplement for improving motility. L-carnitine fuels the mitochondria in the sperm tail that power swimming. Reducing oxidative stress through antioxidants and lifestyle changes also helps.
Morphology: Does Shape Matter?
Morphology assesses the shape of sperm — head shape, midpiece proportions, and tail structure. Using strict Kruger criteria (the standard at most labs), only sperm with perfect form are counted as "normal." Even fertile men typically have only 4-15% normal forms.
DNA Fragmentation: The Test They Might Not Run
Standard semen analyses don't include DNA fragmentation testing, but it's increasingly recognized as an important measure of sperm quality. DNA fragmentation measures the percentage of sperm with damaged DNA — which affects fertilization, embryo development, and miscarriage risk.
When to request it: Unexplained infertility, recurrent miscarriage, failed IVF cycles, or borderline standard parameters. A DNA fragmentation index (DFI) under 15% is considered good; 15-30% is moderate; above 30% is high and may require treatment.
Supplements That Target Specific Parameters
How to Get Tested
Getting a semen analysis is straightforward:
- Where: Your doctor can order one through any fertility clinic or andrology lab. Some labs accept self-referrals.
- Preparation: Abstain from ejaculation for 2-5 days before the test. Not longer — prolonged abstinence actually decreases sperm quality.
- Collection: Typically done via masturbation at the lab or at home with a provided container (delivered within 30-60 minutes at body temperature).
- Cost: Usually $75-$200 without insurance. Many insurance plans cover it as part of a fertility workup.
- At-home options: Companies like Legacy and Fellow offer mail-in kits with lab-grade analysis and results within days.
The Bottom Line
A semen analysis is data, not a diagnosis. Below-reference values don't mean you can't conceive — they mean it may take longer or that investigation is warranted. Above-reference values don't guarantee rapid conception — female factors, timing, and luck all play roles.
The most important things to remember: get two tests before drawing conclusions, address modifiable factors (heat, lifestyle, supplements) for 3 months before retesting, and see a reproductive urologist (not just your GP) if multiple parameters are abnormal.
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Visit LifeFertile →• WHO. WHO Laboratory Manual for the Examination and Processing of Human Semen. 6th Edition, 2021.
• Cooper TG, et al. "World Health Organization reference values for human semen characteristics." Hum Reprod Update. 2010.
• Agarwal A, et al. "Sperm DNA fragmentation: A new guideline for clinicians." World J Mens Health. 2020.
• Majzoub A, Agarwal A. "Systematic review of antioxidant types and doses in male infertility." Arab J Urol. 2018.