Total motility on a semen analysis: reference range and what a low result means
Total motility is the percentage of sperm in your sample that are moving, regardless of how well. It combines progressive motility (sperm swimming forward) with non-progressive motility (sperm moving but not getting anywhere). This page explains how it is graded, the WHO 2021 reference limit of 42%, and what a result under that limit does and does not tell you.
What your number means
| Very low | under 20% motile | Severe asthenozoospermia. If almost all sperm are immotile, a vitality stain is needed to tell dead sperm from live-but-immotile sperm, which points to different causes. Usually requires ICSI if not correctable. |
|---|---|---|
| Low | 20% to 41.9% motile | Below the WHO reference limit. Fertility depends heavily on how many of the motile sperm are progressive and on the total count. Check for delays in processing the sample, infection, varicocele and antisperm antibodies; repeat after 2–3 months. |
| Normal | 42% to 80% motile | Within the fertile range. Above the limit, the progressive fraction and the total motile count are the more informative numbers. |
| High | over 80% motile | Excellent motility, common in fresh samples analysed promptly. No upper limit of concern. |
What it measures
Motility is assessed by placing a drop of liquefied semen on a warmed slide and classifying at least 200 sperm under phase-contrast microscopy. The WHO 2021 manual uses three categories: progressive (PR — moving actively, in a line or a large circle), non-progressive (NP — moving, but the tail beats without moving the head forward, or the sperm swims in tight circles) and immotile (IM). Total motility is PR + NP.
The assessment must be done within 60 minutes of ejaculation, ideally within 30, because motility falls steadily once the sample leaves the body and faster if it cools. This is why labs insist on prompt delivery and why a home-collected sample that arrives late will read low. Some labs also report an automated (CASA) motility figure, which tends to be slightly different from the manual count.
The 2021 manual reintroduced a split of progressive motility into rapid (grade a, ≥ 25 μm/s) and slow (grade b), so some reports now show four categories. Total motility is the sum of everything except immotile in either system.
Why it matters for fertility
Sperm have to travel through cervical mucus, the uterus and the fallopian tube to reach the egg, and only motile sperm can do that. Total motility gives the broad picture of how many sperm are alive and functional; progressive motility says how many can actually make the journey. Both are reported because a sample can have 50% total motility with only 20% progressive, which is a very different situation from 50% total and 45% progressive.
The 42% limit is the 5th percentile in the WHO 2021 fertile reference group. A result below it means you are in the lowest 5% of fertile men on this parameter, not that your sperm cannot fertilise an egg. Prospective studies show conception rates falling gradually below the limit and more sharply once motility is under about 20–25%.
Total motility also feeds into the total motile count (volume × concentration × motility), which is the figure that determines whether IUI is feasible. A high count with low motility can still yield a workable motile count; a low count with low motility usually cannot.
What lowers it
Pre-analytical problems are the commonest reason for a low motility result: delay between collection and analysis, exposure to cold, lubricants (most are spermicidal, including saliva), collection in a non-approved container and traces of soap. These are worth ruling out before assuming a biological cause, and they are why a home-collected sample that took 90 minutes to reach the lab should be repeated.
Biological causes overlap with those for low count: varicocele (heat and oxidative stress impair the tail's mitochondria), genital tract infection and leukocytospermia (white cells release reactive oxygen species), smoking, obesity, and prolonged abstinence (sperm that sit in the epididymis for more than about 7 days lose motility). Fever in the previous 2–3 months has a marked effect.
Antisperm antibodies, often after vasectomy reversal, testicular injury or infection, coat the sperm and cause them to clump (agglutination) and stop moving. Some medications reduce motility specifically: calcium channel blockers, certain SSRIs, sulfasalazine, and long-term opioid use. Rare genetic conditions such as primary ciliary dyskinesia and specific tail-structure defects produce near-zero motility from birth.
A completely immotile sample (0% motility) is a special case. The lab should perform a vitality test to distinguish dead sperm (necrozoospermia) from live sperm with a structural inability to move; the latter can still be used for ICSI once live sperm are identified.
How to improve it
First, get a clean measurement: collect at the lab or deliver within 30–60 minutes, keep the sample at body temperature, use 2–5 days of abstinence and no lubricant. A surprising number of low-motility results resolve on a properly collected repeat.
Treat what can be treated. Antibiotics for a confirmed infection, varicocele repair (which improves motility in most men who have a clinically significant varicocele), weight loss, and stopping smoking all have a measurable effect after one spermatogenic cycle. Where a medication is the likely cause, discuss alternatives with the prescriber rather than stopping it yourself.
Antioxidants such as coenzyme Q10, L-carnitine, vitamin E and zinc have the most evidence for motility of any semen parameter, but "most" is still modest: trials show small average improvements, and the largest randomised trial (MOXI) found no effect on live birth. They may modestly help and are unlikely to harm, but they are an adjunct rather than a fix.
When to retest
A single total motility under 42% should be repeated after 2–3 months with careful attention to collection and delivery time. If the first sample was collected at home or delayed, retest sooner, at 2–4 weeks, because the low result may be an artefact.
After treating a cause (infection, varicocele, lifestyle change), retest at 3 months. Motility tends to respond to varicocele repair a little later than concentration does, so a 6-month sample is worth doing if the 3-month one is unchanged.
If motility is under about 10% on two samples, or 0% on any sample, ask for a vitality test and a referral. Persistent severe asthenozoospermia is usually managed with ICSI rather than with further attempts to raise the number.
Tests that measure this
Related diagnoses
Common questions
What is the normal total motility on a semen analysis?
The WHO 2021 lower reference limit for total motility (progressive plus non-progressive) is 42%. Most fertile men are between about 50% and 75%. Older reports and some labs still use the 2010 limit of 40%; the two-point difference is not clinically significant.
What is the difference between total and progressive motility?
Total motility counts every sperm that moves at all, including ones that twitch in place or swim in tight circles. Progressive motility counts only sperm that move forward in a line or a wide arc. Progressive motility (reference limit 30%) is the more useful figure for predicting whether sperm can reach the egg; total motility mainly tells you how many sperm are alive and active.
Can low motility be caused by the way the sample was collected?
Yes, and it is one of the most common reasons. Motility drops within an hour of ejaculation, faster if the sample gets cold, and lubricants, saliva and soap residue kill or immobilise sperm. If your sample was collected at home and took more than an hour to reach the lab, or if any lubricant was used, repeat the test with on-site collection before reading anything into the result.
What does 0% motility mean?
It means no moving sperm were seen. The lab should then do a vitality stain (eosin-nigrosin or hypo-osmotic swelling test) to find out whether the sperm are dead or alive but unable to move. Dead sperm point to infection, prolonged abstinence or a collection problem; live immotile sperm point to a structural tail defect and can often still be used for ICSI. A 0% result should always be repeated with on-site collection.