Male fertility is checked through a combination of semen analysis, blood hormone tests, and a physical exam. A semen analysis is the single most important first step, giving a detailed picture of sperm count, movement, and shape. Most men start with this test, and depending on the results, a doctor may order additional bloodwork or imaging.
Semen Analysis: The Core Test
A semen analysis is the cornerstone of male fertility testing. You provide a sample, typically by masturbation, into a sterile cup at a clinic or lab. The sample is then examined under a microscope and evaluated across several key parameters.
The World Health Organization sets benchmark values based on the lowest 5th percentile among men who successfully fathered a child within a year. These are the main numbers your results will be measured against:
- Total sperm count: at least 39 million per ejaculate
- Progressive motility: at least 30% of sperm swimming forward effectively
- Normal morphology: at least 4% of sperm with normal shape
Falling below these numbers doesn’t mean you can’t conceive, but it does signal that fertility may be reduced and further investigation is worthwhile. The lab will also measure semen volume, pH, and how quickly the sample liquefies after ejaculation. If results come back abnormal, most doctors will repeat the test a few weeks later, since sperm production fluctuates naturally.
How to Prepare for a Semen Analysis
The WHO recommends abstaining from ejaculation for a minimum of 2 days and a maximum of 7 days before providing your sample. Too short a window and the volume and count may be artificially low. Too long and you may see reduced motility and a higher proportion of older, less viable sperm. Most clinics suggest aiming for 2 to 5 days.
The sample needs to reach the lab within about 30 to 60 minutes of collection and should be kept close to body temperature during transport. Some clinics offer a private collection room on-site to make this easier. Avoid using lubricants during collection, as many contain chemicals that damage sperm.
Physical Exam
A urologist or fertility specialist will examine your scrotum while you’re standing, both in a relaxed state and while bearing down (a Valsalva maneuver). They’re checking for varicoceles, which are enlarged veins in the scrotum that raise the temperature around the testicles and can impair sperm production. Varicoceles are graded on a scale: Grade I can only be felt while bearing down, Grade II is felt without bearing down, and Grade III is visible through the skin.
The doctor also assesses testicular size. A volume difference greater than 10% between the two testicles has been linked to both testicular shrinkage and abnormal semen results, particularly decreased sperm concentration. The exam is quick, lasting just a few minutes, and gives the doctor important clues that blood tests and semen analysis alone can miss.
Hormone Blood Tests
If your semen analysis comes back abnormal, your doctor will likely order blood tests to check the hormones that drive sperm production. The key ones are:
- FSH (follicle-stimulating hormone): normal range is roughly 2 to 12 IU/L. High levels can indicate that the testicles aren’t responding properly to hormonal signals, while low levels may mean the brain isn’t sending enough signal to begin with.
- LH (luteinizing hormone): normal range is about 2 to 9 IU/L. This hormone triggers testosterone production, so abnormal levels point to problems in the hormonal chain.
- Testosterone: the approximate normal range is 8 to 35 nmol/L, though labs vary. Low testosterone can directly impair sperm production and is also tied to low energy, reduced sex drive, and difficulty with erections.
- Prolactin: normal range is roughly 50 to 450 mU/L. Elevated prolactin can suppress the reproductive hormones and is sometimes caused by a small, treatable growth on the pituitary gland.
Together, these results help your doctor figure out whether a fertility problem originates in the testicles themselves or in the hormonal signals from the brain. That distinction changes the treatment approach significantly.
Ultrasound Imaging
A scrotal ultrasound is a painless, non-invasive scan that uses sound waves to visualize the internal structures of the testicles. It’s typically ordered when the physical exam suggests a varicocele, when the semen analysis shows no sperm at all (which could indicate a blockage), or when there’s an unexplained abnormality that needs a closer look.
Doppler imaging, a specialized form of ultrasound that tracks blood flow, is particularly useful for confirming varicoceles. It can detect veins with abnormal blood flow that aren’t obvious on a standard exam. The test takes about 15 to 20 minutes and requires no special preparation.
DNA Fragmentation Testing
Standard semen analysis tells you how many sperm you have and how well they swim, but it doesn’t evaluate the integrity of the DNA inside each sperm. A sperm DNA fragmentation test measures the percentage of sperm carrying damaged genetic material. This test isn’t routine for everyone, but it becomes relevant in specific situations: unexplained infertility despite normal semen results, recurrent miscarriages, repeated failure with IUI or IVF, or when deciding whether varicocele surgery might help before pursuing assisted reproduction.
A DNA fragmentation index above 30% (using common testing methods) is associated with a near-zero chance of natural conception or success with IUI. For IVF, the threshold is slightly lower, around 27%. If your fragmentation is high, treatment options include varicocele repair, lifestyle changes, shorter abstinence intervals, or using sperm retrieved directly from the testicles for procedures like ICSI.
At-Home Sperm Tests: What They Can and Can’t Do
Several over-the-counter kits let you test sperm at home, and they can be a reasonable first step if you want a general sense of where you stand before visiting a clinic. Products like SpermCheck, Trak, SwimCount, and smartphone-based options like YO and ExSeed are widely available and relatively affordable.
The limitation is significant, though. Most home tests measure only one or two parameters, typically sperm concentration or motile sperm count. None of the current home kits evaluate morphology (sperm shape), and most also miss semen volume, pH, or total count. A home test might tell you your concentration looks normal while completely missing the fact that 96% of your sperm have abnormal shape or that motility is severely impaired.
These kits display good accuracy for the single parameter they measure, but they cannot replace a full laboratory semen analysis. Think of them as a screening tool. A normal result offers some reassurance, while an abnormal result is a clear signal to get a complete evaluation. Either way, if you’ve been trying to conceive for 6 to 12 months without success, a clinical workup gives you far more useful information.
Lifestyle Factors That Affect Results
Your habits in the weeks and months before testing can meaningfully shift your results. Sperm take about 72 days to fully develop, so recent lifestyle changes won’t show up immediately, but sustained improvements do make a measurable difference.
Heat exposure is one of the most potent disruptors. One observational study found that regular heat exposure to the groin area increased the risk of low sperm concentration by over 74 times. This includes frequent hot tub or sauna use, placing a laptop directly on your lap, and prolonged sitting in hot environments. Obesity is another major factor: the same research found that men with obesity had nearly 17 times the risk of low sperm concentration and about 6 times the risk of poor motility compared to men at a healthy weight.
Smoking, heavy alcohol use, and anabolic steroid use all suppress sperm production as well. If your first semen analysis comes back borderline, making changes in these areas and retesting in three months is a reasonable next step before pursuing more invasive options.