What to Expect From a Semen Analysis
October 5, 2026
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Male factor infertility plays a role in about half of all cases where couples or individuals have difficulty conceiving.
Because sperm health is involved so often, a semen analysis is usually one of the first tests recommended in a fertility evaluation, and it’s simpler than many people expect.
An abnormal result on one parameter doesn’t mean infertility is inevitable. Many people with abnormal semen analyses go on to conceive, with or without treatment. Some cases fall into a category clinicians call subfertility, where conceiving naturally is harder but not impossible. A normal semen analysis doesn’t guarantee fertility either. These results are one piece of a larger picture.
Results also vary naturally from one sample to the next. Stress, illness, heat exposure, and other temporary factors can affect sperm quality, and sperm takes roughly 70 to 90 days to fully develop from a dividing cell to a mature, motile cell ready for ejaculation.
Because of that timeline, a single test reflects what was happening in your body two to three months earlier, which is exactly why we often recommend repeating an abnormal result before drawing any conclusions from it.
What Is a Semen Analysis?
A semen analysis is a laboratory test that evaluates the health and quantity of sperm in a semen sample. It’s typically one of the first tests recommended when a couple or individual is having difficulty conceiving, and it’s also used after a vasectomy to confirm the procedure worked. The test measures several things at once, not just sperm count.What the Test Measures
- Sperm count (concentration): the number of sperm per milliliter of semen. The WHO reference range is 15 million per mL or more. A low count is called oligospermia, and no sperm at all is called azoospermia.
- Sperm motility: the percentage of sperm that are moving. The WHO reference range is 40% or more moving, with at least 32% showing progressive (forward) movement. Poor motility is called asthenospermia.
- Sperm morphology: the percentage of sperm with a normal shape, which affects a sperm’s ability to penetrate an egg. The WHO reference range is 4% or more with normal form, based on Kruger strict criteria.
- Semen volume: the total amount of semen in the sample. The WHO reference range is 1.5 mL or more. Low volume can point to a blockage or an issue with the seminal vesicles.
How to Prepare for a Semen Analysis
Sperm quality shifts measurably depending on how long you’ve abstained from ejaculation, whether you’ve had alcohol or tobacco recently, and even which medications you’re taking, which means a rushed or unprepared sample can give a misleading result. Following these steps helps the test reflect your actual sperm health rather than a temporary dip or spike.- Abstain from ejaculation for 2 to 5 days before the test. A study of over 2,400 semen samples found that shorter abstinence lowers sperm concentration while longer abstinence reduces motility, so this window produces the most representative sample.
- Avoid alcohol and tobacco for at least a few days beforehand. Research links tobacco use specifically to lower sperm motility and count.
- Tell us about any medications you’re taking. Testosterone and anabolic steroids suppress the hormone signals your body needs to produce sperm, and certain antibiotics can affect sperm production as well.
- Plan to provide the sample at a CARS lab, or at home with transport to the lab within one hour at room temperature. We’ll provide a sterile container and specific instructions either way.
- If masturbation isn’t possible for religious or other personal reasons, a special non-lubricating condom can be used during intercourse to collect the sample instead. Let us know in advance so we can prepare this option for you.
- If producing a sample through ejaculation isn’t possible at all, we can discuss alternative collection methods with you. In some cases that includes a referral to a reproductive urologist for techniques like penile vibratory stimulation or, for certain diagnoses, surgical sperm retrieval directly from the testicle or epididymis.
- Sperm production naturally varies day to day. If your first result comes back abnormal, we may recommend repeating the test 2 to 4 weeks later before drawing any conclusions.
What Happens to the Sample at CARS
Once your sample arrives at our CAP-accredited andrology lab, a trained andrologist evaluates it. Andrologists specialize in male reproductive health, so the person reading your results has specific training in exactly this kind of analysis. Results are typically available within a few days, and we’ll review them with you and explain what they mean for your specific situation. If something comes back abnormal, that typically leads to additional testing, such as hormonal bloodwork, genetic testing, or a referral to a reproductive urologist.How to Read Your Semen Analysis Results
Many people receive their results and aren’t sure what to make of them. Here’s what each parameter means side by side with the reference range:| Parameter | What It Measures | WHO Reference Range | What Low Means |
| Sperm Count | Sperm concentration per mL of semen | 15 million/mL or more | Oligospermia |
| Motility | Percentage of sperm moving | 40% or more moving (32%+ progressive) | Asthenospermia |
| Morphology | Percentage of normally shaped sperm | 4% or more normal form | Teratozoospermia |
| Volume | Total amount of semen | 1.5 mL or more | May indicate a blockage |




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