10 min read
Dec 3, 2025
Understanding Sperm Motility: Causes, Treatments & How It Affects Fertility
Written by
Fertility2Family Team
Medically reviewed by
Evan Kurzyp, RN (AHPRA), BSN, Master of Nursing
Sperm motility describes how well sperm move. If your Australian doctor says your sperm are not moving as expected, you may hear the term asthenozoospermia. Motility matters because sperm need to travel from the cervix to the fallopian tube to reach and fertilise the egg. Many factors affect this journey, including heat, illness, lifestyle, and the way sperm are built. The first step is a semen analysis through an accredited Australian laboratory, which measures movement, number, and shape. Some men improve results with targeted changes to sleep, weight, exercise, and nutrition. Others need medical care for issues such as infection or varicocele. This guide explains what motility means, how it is tested, what the results mean, and when to see a GP or specialist in Australia. It also covers practical steps at home and how ovulation and pregnancy tests fit into a plan to conceive.
Quick Answers About Sperm Motility
What is a good sperm motility percentage?
Most clinics look for at least 40 percent of sperm moving, with about 32 percent showing forward or progressive movement. These figures are typical reference points used in Australia.
Can you conceive with low motility?
Yes, pregnancy can still occur with low motility, although it may take longer. Timing intercourse to the fertile window and addressing lifestyle or medical factors can improve the odds.
How long do lifestyle changes take to show in semen tests?
Sperm develop over about 10 to 12 weeks. Many men repeat semen analysis after three months to see the effect of changes such as quitting smoking or improving diet.
What is sperm motility and asthenozoospermia
Sperm motility is the ability of sperm to move with purpose through cervical mucus and the uterus toward the fallopian tube. Progressive motility means the sperm move forwards in a mostly straight line or large arcs. Non‑progressive motility means they move but do not travel forwards. Total motility is the sum of any movement, whether progressive or not. Asthenozoospermia is the clinical term used when the proportion of moving sperm is below accepted reference limits.
In a typical ejaculate, labs often expect at least 40 percent of sperm to be moving and about 32 percent to be moving forwards. Doctors may also look at the total motile sperm count, which is the number of moving sperm in the whole sample. This number helps guide care, from natural conception through to assisted options. Results are interpreted alongside sperm concentration, morphology, and semen volume for a fair picture of fertility potential.
How sperm swim and reach the egg
Sperm are powered by adenosine triphosphate, often called ATP, made in the mitochondria in the midpiece. ATP fuels the tail to whip and push the sperm through fluid. This energy link between mitochondria and the tail is why general cell health matters for motility. Once inside the female reproductive tract, sperm must keep moving to pass the cervix, cross the uterus, and enter the fallopian tube where fertilisation occurs.
The egg does not swim. Instead, tiny hair-like structures called cilia in the tube help carry the egg along. Many studies suggest sperm can reach the tube within minutes after ejaculation. Good forward movement helps sperm navigate these spaces and arrive in time to meet the egg. Motility also supports the final steps of fertilisation, including penetration of the outer layers of the egg.
Causes of low sperm motility in Australia
Low motility can come from more than one factor. A common physical cause is a varicocele, which is an enlarged vein in the scrotum that raises local temperature and can affect sperm movement. Past infections, untreated sexually transmitted infections, or a high white blood cell count in semen can also harm movement. Some men have issues with hormones that regulate testicular function. Others have genetic changes that affect the flagella, the tail of the sperm, or changes in morphology, which is the shape of the sperm head and tail.
Heat and chemicals matter in Australia’s climate and workplaces. Prolonged heat at the testes can disturb enzymes and membrane function that sperm use for movement. Exposure to industrial solvents, pesticides, or heavy metals can create oxidative stress in reproductive tissue. Tight underwear, long hot baths, or frequent use of saunas may add thermal load. Heavy smoking, high alcohol intake, obesity, and poor sleep quality have all been linked to poorer motility.
Semen analysis and motility testing in Australia
Your GP can arrange a semen analysis at a NATA accredited laboratory. Collection usually happens by masturbation into a sterile container at the clinic, although some labs accept a sample from home if it arrives promptly at the correct temperature. The lab will advise an abstinence period, often around two to three days, to help standardise results. If a first test is abnormal, doctors usually repeat it after a few weeks to confirm the pattern.
Motility is measured under a microscope or by computer assisted semen analysis. The report typically states total motility, progressive motility, and non‑progressive motility. It may also include motile sperm concentration, which is the number of moving sperm per millilitre, and total motile sperm count, which is the number of moving sperm in the whole ejaculate. Some labs report speed measures such as average path velocity in micrometres per second. Results are interpreted with sperm concentration, semen volume, vitality, time to liquefaction, and pH.
Making sense of results and treatment options
A semen sample often contains more than 39 million sperm. As a broad guide, many clinicians consider a total motile sperm count around 20 million per ejaculate as consistent with normal fertility. Counts below five million suggest a lower chance with timed intercourse. Very low motility may point to severe asthenozoospermia. These figures are used with the full report, age, and medical history to plan next steps. Some couples conceive naturally with less than ideal numbers, particularly with accurate timing of intercourse and healthy female factors.
Where results are borderline, doctors may suggest timed intercourse or intrauterine insemination. Where motility is very low, in vitro fertilisation with intracytoplasmic sperm injection can bypass movement issues by injecting a single sperm into the egg. Treatable causes such as varicocele or infection are addressed first when relevant. Each pathway is individual and discussed with your GP or fertility specialist.
At‑home steps that may help, including diet and supplements
Healthy weight, regular movement, and good sleep help the hormones and cell functions that support motility. If you smoke, quitting is one of the best steps you can take. Limit alcohol to the Australian guidelines. Avoid long heat exposure to the testes by keeping baths short, using warm rather than very hot water, and keeping laptops off the lap. Choose looser underwear if you spend long periods seated.
A balanced diet with fish, olive oil, whole grains, legumes, nuts, fruit, and vegetables supplies antioxidants and essential fats that support mitochondrial function. Nutrients often studied for motility include carnitine, vitamin C, vitamin E such as alpha‑tocopherol, coenzyme Q10, and omega‑3 fatty acids. Some men consider targeted supplements. Options such as carnitine and CoQ10 have shown benefits for some users in research. If you are considering a product that supports sperm health, review ingredients and quality, and speak with your GP. You may also wish to review products such as improves sperm motility to understand typical ingredient profiles.
When to see a GP or fertility specialist, and how ovulation or pregnancy tests fit in
See your GP if you have been trying for 12 months without success, or six months if your partner is 35 or older. Seek care sooner if you have a history of undescended testes, testicular surgery, chemotherapy, genital infection, erectile dysfunction, or ejaculation problems. Your GP may repeat the semen analysis, check hormones such as FSH, LH, and testosterone, screen for infections, and arrange a scrotal ultrasound to assess for varicocele. Men with very low motility may be referred to a urologist or fertility specialist for further review. Medicare may subsidise parts of this care under standard criteria.
Couples often use ovulation predictor kits to target the fertile window. Accurate timing can improve the chance of sperm meeting egg, especially if motility is modest. Predicting ovulation also helps decide when to seek help if cycles are irregular. Pregnancy tests help track outcomes and timing for follow up if a period is late. These tools support a clear plan alongside medical advice.
Frequently Asked Questions About Sperm Motility Australia
Does abstinence length change motility results?
Yes. Too short a gap may lower semen volume, and too long a gap may reduce movement. Follow the lab’s instructions, often around two to three days. Keeping conditions consistent helps your doctor interpret changes over time.
Are at‑home semen tests accurate?
Some at‑home kits estimate count or motile sperm. They can be a starting point, but they do not replace a full semen analysis in a NATA accredited lab. See your GP for testing that covers motility, count, morphology, and vitality.
Do heat and cycling affect motility?
Long hot baths, very hot spas, or prolonged heat at the groin can reduce movement. Regular cycling with a well fitted seat is usually fine. If you ride long distances, take breaks, stand on the pedals at intervals, and avoid excessive heat.
How long until lifestyle changes make a difference?
Spermatogenesis takes about 10 to 12 weeks. Many clinicians repeat semen analysis at three months to check for change. Keep consistent habits during that time to give new sperm the best environment to develop.
Does age affect sperm motility?
Male age can reduce motility and increase DNA damage in sperm. The effect varies between men. Healthy weight, exercise, sleep, and not smoking still help at any age. Seek advice sooner if you are over 40 and concerned.
Can treatment of a varicocele improve motility?
For some men with a clear varicocele and abnormal semen tests, repair may improve motility and total motile sperm count. Outcomes depend on age, baseline results, and partner factors. A urologist can advise if surgery is likely to help.
Ready to take the next step in Australia
If you have had a semen analysis that shows low motility, or you are worried about how long trying to conceive is taking, start with a clear plan. Book a visit with your GP and bring any results you have. Ask about a repeat semen analysis, hormone tests, and a scrotal ultrasound if a varicocele is suspected. If your partner’s cycles are irregular, discuss ovulation tracking as well. At home, focus on habits that support motility. Keep a healthy weight, stay active most days, sleep seven to nine hours, quit smoking, and limit alcohol. Avoid unnecessary heat to the testes. Eat a pattern rich in whole foods, fish, nuts, olive oil, and vegetables. Consider targeted supplements only after discussing them with your doctor. Use ovulation predictor kits to time intercourse to the fertile window. If results remain low, ask for a referral to a fertility specialist to discuss options, including insemination or IVF if needed. Many couples move forward with the right support.
https://www.healthdirect.gov.au/
https://www.health.nsw.gov.au/publications/Pages/fertility-and-age.aspx
https://www.health.qld.gov.au/news-events/news/fertility-boost-tips-male-female
https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/infertility
https://www.health.wa.gov.au/Articles/F_I/Infertility
https://healthyliving.nsw.gov.au/healthyliving/healthy-weight/
