If you and your partner have been trying to conceive for 12 months without success, or 6 months if the female partner is over 35, the next step is a fertility evaluation for both of you. Male factor issues show up in roughly half of all infertility cases, so the workup is not a formality. A complete male assessment looks at five layers: history, physical exam, semen analysis, hormone labs, and imaging, with genetic testing added only when the numbers point that way.
Most men walk in expecting a single sperm test and walk out with a clearer picture of their overall health. The same habits and conditions that affect sperm often show up in cardiovascular, metabolic, and hormonal health. That is why the assessment feels broad. It should.
History and physical exam: the first 20 minutes
A reproductive urologist starts with questions that feel personal for good reason. Sperm production is sensitive to a long list of insults, and most of them leave a trail in your history.
Expect to be asked about:
- Any previous pregnancies with a current or past partner
- Childhood issues like undescended testicles, hernia repair, or mumps after puberty
- Infections, including sexually transmitted infections, prostatitis, or epididymitis
- Surgeries in the groin, scrotum, or pelvis
- Medications, including testosterone replacement, finasteride, chemotherapy, or radiation
- Heat exposure: regular sauna use, hot tubs, long bike rides, or a laptop parked on the lap for hours
- Lifestyle factors: smoking, alcohol, cannabis, recreational drugs, and sleep patterns
The physical exam checks testicular size and firmness, the epididymis, and the vas deferens on both sides. The clinician also feels the scrotum while you stand and bear down slightly to detect a varicocele, which is an enlarged network of veins that raises scrotal temperature. Testicular volume matters because most of the testicle is sperm-producing tubules. Small, soft testicles often point to reduced sperm production before a single lab result comes back.
Semen analysis: the test everyone thinks about
A semen analysis is the core of the assessment, but it is not a pass/fail test. The sample is usually produced by masturbation into a sterile container after 2 to 5 days of abstinence. That window matters. Too short and the count looks artificially low. Too long and motility may suffer because older sperm accumulate.
The lab measures several parameters. The World Health Organization publishes reference values that most labs use. The 2021 WHO criteria define the lower reference limits as:
- Volume: 1.4 mL or more per ejaculate
- Sperm concentration: 16 million sperm per mL or more
- Total sperm count: 39 million or more per ejaculate
- Total motility: 42 percent or more moving
- Progressive motility: 30 percent or more moving forward
- Normal morphology: 4 percent or more with normal shape under strict criteria
Those numbers are the lower edge of a fertile population, not a threshold where fertility switches off. A man with 15 million sperm per mL is not sterile. The context matters. One abnormal value also needs a repeat test in 2 to 3 months because sperm production cycles take about 74 days and results swing with illness, fever, stress, or a bad night of sleep before the sample. If you had a fever in the past 2 to 3 months, mention it. That alone can depress a sample for weeks.
Hormone labs: the control system
Sperm production runs on a feedback loop between the brain and the testicles. Blood work checks whether that loop is intact. The standard panel includes:
- FSH (follicle-stimulating hormone): High FSH often means the testicles are struggling and the brain is shouting louder to compensate. Low FSH can point to a pituitary problem that affects sperm production.
- LH (luteinizing hormone): LH drives testosterone production in the Leydig cells. High LH with low testosterone suggests the testicles are not responding normally.
- Total testosterone: Low testosterone can reduce libido and may affect sperm production, but the relationship is not simple. Many men with normal testosterone have low sperm counts, and some men with low testosterone still produce sperm.
- Prolactin: A pituitary hormone that, when elevated, can suppress the signals that drive sperm production.
- Estradiol: Men make estrogen too. Very high levels, sometimes from excess body fat or medication, can feed back and lower testosterone production.
Some clinics add thyroid function, vitamin D, or other markers, but the core loop is FSH, LH, testosterone, prolactin, and estradiol. The pattern across these values tells the urologist whether the problem sits in the brain, the testicles, or downstream in the plumbing.
Imaging: looking at the anatomy
A scrotal ultrasound uses sound waves to map the testicles, epididymis, and blood flow. It catches things a physical exam can miss. The most common finding is a varicocele, which shows up as dilated veins on one side, usually the left. Varicocele is the most frequently identified correctable factor in male infertility, though not every varicocele needs treatment. Ultrasound also detects hydroceles, epididymal cysts, testicular masses, and absence of the vas deferens.
In some cases, a transrectal ultrasound checks the prostate and seminal vesicles when ejaculate volume is very low. That can reveal a blockage in the ducts that carry sperm from the testicles out through the penis.
Genetic testing: not for everyone, but sometimes needed
When a semen analysis shows no sperm or very few sperm, the next layer is genetic. Three tests come up most often.
A karyotype looks at the number and structure of chromosomes. Klinefelter syndrome, where a man has an extra X chromosome, is one of the most common genetic causes of azoospermia. A Y chromosome microdeletion test checks for missing segments on the Y chromosome that contain genes needed for sperm production. If a man has no sperm and very low volume, testing for mutations in the CFTR gene can identify congenital absence of the vas deferens, a condition linked to cystic fibrosis.
These tests are not routine for every man. A reproductive urologist orders them when the clinical picture or semen parameters suggest a genetic cause. The results matter because they affect whether sperm can be retrieved surgically and whether the condition could pass to a child.
Advanced tests some clinics add
Sperm DNA fragmentation testing measures the amount of broken DNA inside sperm heads. It is not a standard first-line test, and expert guidelines do not recommend it for everyone. Some clinicians order it after recurrent pregnancy loss or repeated failed IVF cycles to decide whether to use a different sperm selection technique. The evidence on how much it changes outcomes is still mixed.
A post-ejaculation urinalysis checks for sperm in the urine. If sperm appear there after orgasm, the ejaculate may be flowing backward into the bladder, a condition called retrograde ejaculation. This shows up when semen volume is very low despite normal hormone labs and no blockage.
Lifestyle and environmental review
The assessment also includes a hard look at the things you control. Sauna-level heat temporarily lowers sperm count and can worsen morphology (Garolla et al., Human Reproduction, 2013). The effect reverses once the heat exposure stops, because sperm production needs the testicles a few degrees cooler than core body temperature. Hot tubs, heated car seats, tight underwear that traps heat, and a laptop resting directly on the lap all fall into the same category. A man trying to make sense of this does not need to avoid heat forever, but knowing what the research says helps when his clinician asks about it.
Smoking, heavy alcohol use, cannabis, and some recreational drugs have been linked to lower sperm parameters in multiple studies. Excess body fat alters the ratio of testosterone to estrogen. Poor sleep and chronic stress raise cortisol, which can interfere with the hormonal drive behind sperm production. Occupational exposures to pesticides, heavy metals, solvents, and radiation also belong in the conversation. The clinician may not ask about every one of these, so bring them up if you work in construction, agriculture, painting, welding, or any job with regular chemical exposure.
Putting the results together
After the tests are back, the urologist looks for patterns rather than single numbers. A low sperm count with high FSH and small testicles points to a problem in the testicles themselves. A low count with low FSH and low LH points to the brain not sending enough signal. Normal hormones with no sperm in the ejaculate suggests an obstruction somewhere in the ducts. Each pattern leads to a different set of options.
The categories you may hear are oligospermia, meaning fewer sperm than the reference range. Asthenozoospermia means reduced motility. Teratozoospermia means a higher percentage of abnormally shaped sperm. Azoospermia means no sperm in the ejaculate. These terms describe findings, not a final verdict. A man with oligospermia and normal hormones may still conceive without assistance, while a man with normal parameters can still struggle if the female partner has her own factors.
What you can do with the information
A fertility assessment gives you a map, not a judgment. Some findings are reversible. Stopping regular sauna use, switching away from tight heat-trapping underwear, quitting smoking, losing excess weight, or stopping a medication under a doctor's supervision can shift semen parameters over a few months. A varicocele repair may improve sperm parameters in men with a palpable varicocele, abnormal semen analysis, and otherwise unexplained infertility. When those options do not fit, assisted reproductive technologies like intrauterine insemination or IVF with intracytoplasmic sperm injection are built around the numbers from this workup.
The most practical step after an abnormal result is to repeat the semen analysis in 2 to 3 months and to see a reproductive urologist rather than a general practitioner for the interpretation. Sperm production is slow, so the results will not change overnight. The results also do not measure your masculinity or your overall virility. They map a system that can be influenced by anatomy, hormones, genetics, and daily habits. That is useful, not personal.
This content is for educational purposes only and is not medical advice. Oakman products are designed for physical comfort and cooling; they make no claims about fertility, sperm quality, or hormone levels. Consult a healthcare professional for personalized advice.