Semen Analysis Test
A semen analysis measures the quantity and quality of semen and sperm to check for fertility problems or to confirm a successful vasectomy.
What this test measures
A semen analysis measures volume, sperm count, sperm concentration, sperm movement (motility), sperm shape (morphology), pH, time to liquefaction, and white blood cells in semen.
What your results mean
Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.
Frequently asked questions
What is a semen analysis?
A semen analysis, also called a sperm count, measures the quantity and quality of semen and sperm.
Why is a semen analysis done?
It helps find out if there is a problem with semen or sperm that may cause infertility, or to see if a vasectomy has been successful.
What does a low sperm count mean?
A sperm count lower than 39 million in the entire sample may make it difficult to get your partner pregnant.
What does a low motility percentage mean?
If less than 40% of your sperm are able to move efficiently, the odds of one reaching and fertilizing the egg may be lower.
What do results after a vasectomy mean?
If no sperm is found, you and your partner should be able to stop using other forms of birth control. If sperm is found, you'll need repeat testing until no sperm is present.
Related lab tests
Sources
- MedlinePlus: Semen Analysis — NIH MedlinePlus
Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.