What is Sperm Motility?

Sperm Motility refers to how well the sperm in a given semen sample are moving and it is one of the parameters looked at in a semen analysis. As long as at least 40% of the sperm in a sample are moving, this is considered normal sperm motility.

Normal Sperm Motility

Since sperm have to be able to swim to reach the egg in order to join with it, normal sperm motility plays a pretty big role in men’s reproductive health. Natural conception and pregnancy cannot happen if sperm are unable to move. Not all the sperm have to be able to move, though. When considering the percentage of sperm which are able to move in a particular semen sample, anything above 40% is generally considered normal. That is, as long as at least 40% of the sperm in a sample are moving, this is considered normal sperm motility.

Doctors also take into consideration progressive motility – how many sperm are able to move from one place to another, as opposed to just twitching around or going in circles. In this case, as long as at least 32% of the sperm in a sample are progressively motile, this is considered normal.

Finally, doctors consider how many sperm are swimming rapidly and in a fairly straight path, because it is these sperm which are most likely to fertilize an egg. A normal percentage of these quick, straight-moving sperm is above 12%.

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Low Sperm Motility

If a semen analysis indicates that a man has low sperm motility, this means that his sperm will have a difficult time reaching an egg in order to fertilize it. Low sperm motility can cause male factor infertility.

Since each case of male infertility is unique, a man should talk to his doctor about how to increase sperm motility. However, each of the following lifestyle changes have been shown to help produce healthier sperm:

  • Maintaining a healthy weight
  • Keeping stress levels low
  • Exercising regularly
  • Eating a healthy diet
  • Avoiding sexually transmitted infections (STIs)
  • Quitting smoking
  • Limiting alcohol
  • Avoiding overheating of the genitals (by laptops, saunas, and hot tubs)
  • Avoiding exposure to pesticides, lead, and other toxic chemicals

Treating Low Sperm Motility

If these lifestyle changes have already been tried or can’t be altered for whatever reason, there are still medical procedures that can assist a couple in getting pregnant despite low sperm motility.

Intrauterine insemination (IUI), a procedure by which sperm are directly inserted into the uterus so that they have less of a distance to swim, is sometimes used for men whose sperm motility is only a little low – in the 30% to 40% range.

However, for these men and others whose motility is even lower, IVF (in vitro fertilization) is often a more successful treatment. This involves fertilizing an egg with sperm in a lab dish.

Ultimately, male infertility problems are dynamic and you should see a male fertility specialist, typically an urologist or andrologist. Need a good recommendation for a doctor? Get in touch with us.

Kristin Brogaard, PhD

Kristin Brogaard, PhD is Co-founder and CSO of Inherent Biosciences, a molecular diagnostics company at the intersection of epigenetics and AI. Dr. Brogaard is an experienced molecular biologist, study director, and operations manager for early stage biotech startups. She received her PhD in Molecular Biology from Northwestern University developing novel epigenetic technologies. She subsequently worked with Dr. Leroy Hood, a pioneer in personalized medicine technologies, first as a post-doc and then as a colleague launching a novel scientific wellness start-up, Arivale. Dr. Brogaard has broad business experience that includes launching and scaling the health startup, Arivale. Additionally, Dr. Brogaard was the Director of Program Management at Arivale managing all strategic projects with a highly qualified team of program and project managers.

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