You can check your sperm count in two ways: with an at-home test kit that gives a basic high-or-low reading, or with a clinical semen analysis that provides a detailed breakdown of count, movement, and shape. A count below 15 million sperm per milliliter of semen is considered lower than typical, and that threshold is what both home and lab tests measure against.
Which option makes sense depends on what you’re trying to learn. If you want a quick, private screening before deciding whether to see a specialist, a home test can be a reasonable first step. If you’re actively trying to conceive and having trouble, or if a home test flags a low result, a full lab analysis gives you and a doctor far more to work with.
Home Sperm Test Kits
Over-the-counter home tests fall into two categories. The first type uses a lateral flow strip, similar in concept to a pregnancy test. You mix a semen sample with a solution, apply it to the strip, and read a positive or negative result. SpermCheck Fertility is the most well-known example. The second type turns your smartphone into a miniature microscope. The YO Home Sperm Test, for instance, uses a small clip that fits over your phone’s camera. Software on the phone captures video of the sample and analyzes the movement of sperm automatically.
Both types are FDA-cleared for home use, but both are qualitative. That means they tell you whether your motile sperm concentration falls above or below a cutoff, not a precise number. The YO test, for example, uses a threshold of 6 million motile sperm per milliliter: below that is flagged as low, at or above is labeled moderate to normal. These kits cannot assess sperm shape, DNA quality, or the chemical makeup of your semen. They’re a screening tool, not a diagnosis.
To get the most reliable result from a home kit, follow the abstinence window (more on that below) and read the instructions carefully. A single test is just a snapshot. Sperm counts fluctuate from day to day, so most kits recommend testing at least twice, a few weeks apart.
What Happens During a Lab Semen Analysis
A clinical semen analysis is the standard diagnostic test. You produce a sample by masturbating, either in a private room at a fertility clinic or lab, or at home if you can deliver the sample within the time window the lab specifies (usually 30 to 60 minutes, kept at body temperature). You’ll need to bring a government-issued photo ID to verify your identity.
A technician examines the sample under a microscope and evaluates several things at once:
- Sperm count: the number of sperm per milliliter and the total count in the full sample.
- Motility: the percentage of sperm that are moving and how well they swim forward. Normally, more than 50% of sperm in a sample should be motile.
- Morphology: the percentage of sperm with a normal shape (head, midpiece, and tail all formed correctly).
- Volume and pH: how much semen you produced and whether its acidity level is in a healthy range, since overly acidic semen can harm sperm.
- Viscosity: how thick the semen is. Increased thickness can slow sperm movement.
Because counts vary naturally, your doctor will often ask for two or more samples collected a few weeks apart before drawing any conclusions.
How to Prepare Before Either Test
The preparation is the same whether you’re using a home kit or going to a lab. Avoid any sexual activity that causes ejaculation for 2 to 3 days before the test. This gives your body enough time to build a representative sample. Don’t abstain for longer than 5 days, though. After that point, older sperm begin to degrade and the quality of the sample drops, which can skew your results in the opposite direction.
Illness, fever, heavy alcohol use, and certain medications can also temporarily suppress sperm production. If you’ve been sick in the past few weeks or are taking a new medication, mention that to your doctor or keep it in mind when interpreting a home test. A single low result during or right after an illness may not reflect your baseline.
Understanding Your Results
The key number most people focus on is concentration: how many sperm per milliliter. Below 15 million per milliliter is classified as a low sperm count, a condition called oligospermia. A complete absence of sperm in the sample is called azoospermia. Both require follow-up with a urologist or reproductive endocrinologist to figure out the underlying cause.
But count alone doesn’t tell the whole story. A man with a solid sperm count but very poor motility or abnormal shape can still have difficulty conceiving. Motility matters because sperm need to swim through the cervix and into the fallopian tube. When fewer than 4% of sperm have a normal shape under strict evaluation criteria, fertilization rates drop significantly without assisted reproduction. That said, morphology on its own is a relatively weak predictor of pregnancy. It’s the combination of count, motility, and shape that gives doctors the clearest picture.
Common Causes of a Low Result
A low sperm count can stem from a wide range of conditions. The most common is a varicocele, a swelling of the veins that drain the testicle, which raises the temperature around the sperm-producing tissue. Hormonal imbalances involving testosterone, thyroid hormones, or signals from the pituitary gland can also reduce sperm production. Infections, particularly repeated ones, may damage or scar the tubes that carry sperm out of the body.
Some causes are structural or genetic. Men born with undescended testicles have a higher likelihood of reduced fertility in adulthood. Genetic conditions like Klinefelter syndrome directly impair the body’s ability to produce sperm. Retrograde ejaculation, where semen flows backward into the bladder during orgasm instead of out through the penis, can occur in men with diabetes, spinal injuries, or a history of certain surgeries.
Lifestyle and environmental factors play a role too. Prolonged heat exposure to the groin (from laptops, hot tubs, or tight clothing), tobacco use, and heavy drinking can all lower counts temporarily or over time. The 2025 World Health Organization infertility guideline specifically links tobacco cessation to improved reproductive outcomes, recommending structured quit programs rather than vague advice to “cut back.”
Home Test vs. Lab Test: Which to Choose
If you’re curious about where you stand and aren’t actively trying to conceive, a home test offers a low-stakes starting point. It’s private, relatively inexpensive, and gives you a basic answer within minutes. But it can’t replace a clinical semen analysis when fertility is actually on the line. Home kits miss too much: motility quality, morphology, volume, pH, and viscosity are all invisible to a strip or smartphone screen.
A lab semen analysis typically costs between $50 and $300 out of pocket depending on the lab and your location, though insurance sometimes covers it when ordered as part of a fertility workup. The 2025 WHO guideline now recommends that both partners be evaluated in parallel when a couple has trouble conceiving, rather than testing the female partner first, making semen analysis an expected early step rather than a last resort.
Whatever route you take, keep in mind that a single test is never definitive. Sperm production takes roughly 74 days from start to finish, so your results today reflect conditions from two to three months ago. Testing more than once gives a much more reliable picture of your actual fertility.