Total sperm count on a semen analysis: reference range and what a low result means
Total sperm count is the number of sperm in the entire ejaculate, calculated by multiplying semen volume by concentration. It is the best single measure of how much sperm the testicles are producing, because it is not distorted by a large or small volume. This page explains the WHO 2021 reference limit of 39 million and how to interpret a result below it.
What your number means
| Very low | under 10 million per ejaculate | Severe reduction in output. Usually goes with a concentration under 5 M/mL and calls for hormone and genetic testing plus a reproductive urology referral. IVF with ICSI is the usual route if a cause cannot be corrected. |
|---|---|---|
| Low | 10 to 38.9 million per ejaculate | Below the WHO reference limit. Natural conception remains possible, particularly toward the upper end and with good motility. Check for a fixable cause and repeat the test after 2–3 months. |
| Normal | 39 to about 300 million per ejaculate | Within the range of 95% of fertile men. Once you are above the limit, the number of those sperm that are motile (the total motile count) is the more useful figure. |
| High | over 500 million per ejaculate | High output, usually reflecting a large volume with a normal concentration. Not associated with any fertility problem and needs no follow-up. |
What it measures
Total sperm count is not measured directly. The lab measures the semen volume (by weighing the sample or reading a graduated tube) and the sperm concentration in a counting chamber, then multiplies them. A sample of 3 mL at 20 M/mL has a total count of 60 million; a sample of 1.5 mL at 20 M/mL has a total count of 30 million and would be flagged as low, even though the concentration is identical.
Because it depends on volume, total sperm count is sensitive to collection problems in a way concentration is not. Losing the first part of the ejaculate, which contains most of the sperm, or losing any part of it, lowers the total count directly. Always tell the lab if a sample was incomplete.
Reports sometimes call this "total sperm number" or abbreviate it TSC. It is different from total motile count (TMC or TMSC), which multiplies the total count by the percentage of motile sperm and is the figure most fertility clinics use for treatment planning.
Why it matters for fertility
Total sperm count reflects the output of both testicles over the abstinence period, which makes it the closest thing on a routine semen analysis to a measure of testicular function. Studies of testicular biopsies and hormone levels correlate better with total count than with concentration.
The 39 million reference limit is the 5th percentile of the WHO 2021 fertile reference population. Like every WHO limit it marks the bottom of the fertile range, not the edge of infertility: 5% of men who fathered a child within a year had a total count below it.
For treatment planning, clinics look at the total count alongside motility. A total count of 30 million with 60% progressive motility gives 18 million motile sperm, which is enough for timed intercourse or IUI in many cases. The same 30 million with 15% progressive motility gives 4.5 million, which usually points toward IVF.
What lowers it
Anything that lowers concentration lowers total count: varicocele, heat exposure, obesity, smoking, testosterone or anabolic steroid use, 5-alpha-reductase inhibitors, certain SSRIs and opioids, fever in the preceding 3 months, undescended testicles, past chemotherapy, and hormonal or genetic disorders. See the sperm concentration page for a detailed breakdown.
In addition, anything that lowers semen volume lowers total count even when concentration is normal. Short abstinence (under 48 hours) reduces both the volume and the number of sperm that have accumulated in the epididymis. Partial retrograde ejaculation, where some semen goes backward into the bladder, is a common and often unrecognised cause of a low total count with a normal concentration.
Age has a modest effect. Total sperm count declines slowly after about 40, mostly through a fall in volume and a rise in DNA fragmentation rather than a dramatic drop in production. It is rarely the main explanation for a low result in a man under 50.
How to improve it
The fixes are the same as for concentration, because that is usually where the problem lies: stop testosterone or steroids, repair a significant varicocele, remove heat exposure, lose excess weight, stop smoking and moderate alcohol. Each of these takes at least one spermatogenic cycle (about 74 days, plus 2 weeks of epididymal transit) to show up in a semen sample.
If volume is the weak link, adjusting abstinence to 2–5 days before the test often brings both volume and total count up. If retrograde ejaculation is suspected (low volume, cloudy urine after sex, diabetes, prior prostate or bladder-neck surgery, alpha-blocker use), a post-ejaculation urine test confirms it and there are medical options such as pseudoephedrine or imipramine, or sperm can be retrieved from the urine for IUI or IVF.
Antioxidant supplements may modestly raise total count in men with low values, but the effect in trials is small and inconsistent. They are reasonable as an adjunct while a real cause is being addressed, not as a substitute for finding one.
When to retest
A total count under 39 million should be confirmed on a second sample 2–3 months later, collected after 2–7 days of abstinence, with the full ejaculate captured. Semen parameters vary a great deal between samples, and about a third of low results normalise on repeat testing without any intervention.
After a change (varicocele repair, stopping a medication, weight loss), retest at 3 months and again at 6 months. Improvements from stopping testosterone in particular can continue for over a year.
If two samples both show a total count under 10 million, the next step is not another semen analysis but hormone testing, a physical exam and a reproductive urology referral to look for a cause.
Tests that measure this
Related diagnoses
Common questions
What is a normal total sperm count?
The WHO 2021 lower reference limit is 39 million sperm per ejaculate, which is the 5th percentile of fertile men. Typical values in fertile men cluster between about 100 and 300 million. A result above 39 million is within the fertile range; a result below it should be repeated and, if confirmed, investigated for a cause.
Which matters more, total sperm count or concentration?
Total count is the better measure of testicular output, because a large or small semen volume can make concentration look worse or better than production actually is. Concentration is still useful for certain thresholds (for example, whether IUI is feasible) and is the parameter most research has been done on. Clinics look at both, and then at the total motile count.
How is total sperm count calculated?
Total sperm count = semen volume (mL) × sperm concentration (million/mL). For example, 2.5 mL × 30 M/mL = 75 million. The lab does this calculation for you; if your report does not show it, you can multiply the two numbers yourself. Because volume is part of the equation, an incomplete sample will make the result read low.
Can a low total sperm count still lead to natural pregnancy?
Yes, particularly in the 20–39 million range with good motility and a partner under 35. The chance of conception per cycle is lower than average but not negligible. Below about 10 million, natural pregnancy becomes uncommon and most couples are advised to consider IVF with ICSI after a cause has been looked for.