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Semen Analysis
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

Semen Analysis

A semen analysis measures the quantity and quality of sperm to help identify potential causes of male infertility or to confirm the success of a vasectomy.

What is a semen analysis?

A semen analysis (or sperm count) evaluates the fluid released during ejaculation. It measures several factors, including the number of sperm, their movement (motility), and their shape (morphology). These metrics are vital for determining if sperm can successfully reach and fertilize an egg.

What is it used for?

This test is used to investigate infertility—defined as the inability to conceive after 12 months of trying—or to verify that a vasectomy has successfully prevented sperm from entering the semen. Key measurements include:

  • Volume: Total amount of semen.
  • Sperm count and concentration: Total number of sperm and density per milliliter.
  • Motility: Percentage of sperm moving efficiently.
  • Morphology: Percentage of sperm with a normal shape.
  • pH and liquefaction time: Indicators of chemical balance and fluid consistency.

What happens during a semen analysis?

You will provide a semen sample, typically via masturbation into a sterile container in a private room at a lab. To ensure accuracy:

  • Urinate and wash your hands and penis before collection to avoid contamination.
  • Do not use lubricants or saliva, as these can harm sperm.
  • Collect the entire sample; if any is missed, inform your provider.
  • If collecting at home, the sample must be kept at room temperature and delivered to the lab within one hour.

Because sperm quality can fluctuate, your provider may request multiple samples over several weeks.

Preparation and Risks

You must avoid all sexual activity resulting in ejaculation for 2–7 days before the test to ensure the sperm count is at its peak. There are no known risks associated with providing a semen sample.

What do the results mean?

Results are compared against standard normal ranges. For example, a normal sperm count is generally considered to be more than 39 million per sample, with over 40% motility and over 4% normal morphology. Abnormal results do not necessarily mean permanent infertility; they may indicate issues such as infections, hormonal imbalances, or physical conditions like a varicocele (enlarged vein in the testicles). Your provider may order further testing or refer you to a fertility specialist to determine the best course of treatment.

Frequently Asked Questions

bnormal results, such as low count (oligospermia), poor motility (asthenozoospermia), or abnormal shape (teratozoospermia), indicate potential fertility issues but do not necessarily mean you cannot conceive. These conditions can be temporary or caused by treatable factors like varicoceles, hormonal imbalances, or infections. Because sperm production takes about 72 to 90 days, lifestyle changes or medical treatments may improve results over time. Your provider will likely order a repeat test in 2 to 3 months to see if there are any changes before recommending further diagnostic steps.
While the time of day has minimal impact, your recent lifestyle choices can significantly alter results. Alcohol consumption, smoking, and exposure to environmental toxins can temporarily reduce sperm count and motility. It is recommended to avoid heavy alcohol intake and smoking for at least two weeks before the test. Additionally, a fever or illness within the previous 3 to 4 weeks can temporarily lower sperm production, so it is best to wait until you are fully recovered before providing a sample.
If you are unable to ejaculate in the clinic due to anxiety or other reasons, inform the staff immediately. They may provide a private room with a longer waiting period or allow you to collect the sample at home. If collecting at home, you must use the sterile container provided, keep the sample at room temperature (not in the refrigerator), and deliver it to the lab within one hour. If you miss any part of the ejaculation, you must inform the lab, as this can skew the volume and concentration measurements.
You should not have a semen analysis immediately after a vasectomy because residual sperm may still be present in the reproductive tract. Standard medical guidelines recommend waiting at least 12 weeks or 20 ejaculations after the procedure before testing. Your provider will likely request two separate samples, several weeks apart, to confirm that the sperm count is zero or extremely low, ensuring the procedure was successful before you resume unprotected intercourse.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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