Semen analysis
Key points
- A semen analysis is a test to evaluate the fertility of men.
- Semen is the thick, white, sperm-containing fluid excreted during ejaculation.
- There should be no sexual activity that causes ejaculation for 2 to 3 days before the test.
- If the man is uncomfortable about how the sample is to be taken, this should be discussed with the health care provider.
Alternative names
Male fertility test; Sperm count
Definition
A semen analysis is a test to evaluate the fertility of men.
How the test is performed
A semen sample will be obtained. Semen is the thick, white, sperm-containing fluid excreted during ejaculation. The method of sample collection should be discussed with the health care provider.
The sample may be obtained by masturbation into a sterile container. It may also be achieved by intercourse using a special condom supplied by the health care provider. The sample must be analyzed within 2 hours of the collection. The earlier the sample is analyzed the more reliable the results are.
How to prepare for the test
There should be no sexual activity that causes ejaculation for 2 to 3 days before the test.
How the test will feel
If the man is uncomfortable about how the sample is to be taken, this should be discussed with the health care provider.
Why the test is performed
The test is performed if the patient's fertility is in question. It is helpful in determining if there is a problem in sperm production or quality of the sperm as a cause of infertility. The test may also be used after a vasectomy to make sure there are no sperm in the semen.
Normal Values
The semen is analyzed for the volume; number and structure of the sperm; sperm movement; and the fluid thickness, acidity, and sugar content.
Values may vary from laboratory to laboratory. The most common normal values are listed below.
The normal volume varies from 1.5 to 5.0 milliliter per ejaculation. The sperm count varies from 20 to 150 million sperm per milliliter. At least 60% of the sperm should have a normal shape and show normal forward movement (motility).
What abnormal results mean
If the sperm count is very low or very high there is a likelihood of being less fertile. The percent of normal sperm has an affect on infertility. The acidity of the semen and the presence of white blood cells (suggesting infection) may influence fertility. The use of many recreational and prescription drugs, alcohol, and tobacco use may affect fertility.
Written and revised by
Gerald Hurowitz, M.D.
Our doctors write and review articles for accuracy and keep them up to date.
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