When should a man test his sperm quality?

Two tests, two questions

A hormone panel and a semen analysis are sometimes treated as if they're substitutes. They aren't. They answer different questions and they fail in different places.

A hormone panel — total + free testosterone, FSH, LH, SHBG, prolactin, estradiol — describes the hypothalamic-pituitary-testicular axis. It tells you whether the brain is signalling correctly, whether the testes are producing testosterone, whether the binding-globulin ratio is reasonable, and whether there are common upstream causes (prolactinoma, pituitary insufficiency) of impaired output.

A semen analysis tells you what the testes are actually producing. Count, concentration, total motility, progressive motility, morphology by strict criteria, and — when the lab supports it — DNA fragmentation. It is the closest thing we have to a direct measurement of the system in operation.

A man can have a perfectly clean hormone panel and a poor semen analysis. He can also have an alarming hormone panel and a passable semen analysis. The two tests overlap in what they screen for, but neither replaces the other for serious questions.

When sperm-side testing earns its keep

Five clear cases where a semen analysis is the right test, not the hormone panel.

One: trying to conceive, no success after a meaningful interval. ESHRE and AUA guidance both recommend male evaluation if pregnancy hasn't been achieved after 12 months of regular unprotected intercourse — earlier (6 months) if the female partner is over 35 or there are known risk factors. Inside that "male evaluation," semen analysis is the headline test. Hormones are useful adjuncts; they are not enough on their own.

Two: a known reason to suspect testicular function. History of varicocele, undescended testis, post-pubertal mumps with orchitis, chemotherapy, radiation, testicular trauma or surgery, or genetic conditions with known fertility implications. In these cases, a semen analysis is the test that quantifies the actual impact.

Three: before starting TRT or any therapy that suppresses the axis. A baseline semen analysis before exogenous androgens documents what you are about to lose. Combined with sperm cryopreservation, it is the most useful pre-TRT step a man can take if children are anywhere on his roadmap.

Four: monitoring after an intervention. Varicocele repair, weight loss, treatment of an upstream cause (prolactinoma, hypogonadotropic hypogonadism), TRT pause for fertility — all warrant a follow-up semen analysis at least one full spermatogenesis cycle (~90 days) after the change.

Five: men over 40 thinking about biological children. Sperm parameters and DNA integrity decline gradually with age. Knowing your current numbers — particularly DFI — informs whether and how aggressively to act. A man at 42 with a normal-range count but an elevated DFI is in a different decision frame than a man at 42 with both in range.

What a meaningful semen analysis includes

WHO 2021 reference values for semen parameters set the floor for what counts as a clinically useful report. A baseline-quality analysis includes:

• Total sperm number per ejaculate (≥ 39 million)
• Concentration (≥ 16 million/mL)
• Total motility (≥ 42%)
• Progressive motility (≥ 30%)
• Normal morphology by strict (Kruger) criteria (≥ 4%)
• Volume (≥ 1.4 mL)
• Vitality in selected cases

Most decent labs deliver this set. The parameter that is routinely missing — and that we believe should be standard — is DNA fragmentation index (DFI). DFI measures the proportion of sperm with strand breaks in their DNA. It correlates with embryo quality, fertilisation rates and miscarriage outcomes independently of count and motility. A man with normal-looking standard parameters and a DFI of 30% has a different fertility risk profile than the same standard parameters and a DFI of 12%. Most clinic panels skip DFI because it requires a separate flow-cytometry or chromatin assay; we don't think that's a defensible omission for serious fertility questions.

When the hormone panel is the better first test

If you cannot do both, run hormones first. There are a few reasons:

• Hormones screen for treatable upstream causes — hyperprolactinaemia, secondary hypogonadism, severe under-eating — that change the answer entirely. Catching these first avoids a "we found a problem" semen result without context.
• Hormones turn around faster. Three to five working days is typical for a panel. Semen analysis is comparable, but the logistics (sample timing, abstinence window, courier) are more involved.
• Hormones are cheaper. This matters when the question is "should I take this further?" rather than "I'm certain I have a fertility problem."
• Hormones produce decision-useful data even in the absence of an immediate fertility question. A man at 32 with no current trying-to-conceive context still benefits from knowing his baseline.

Where this leaves you

If you are trying to conceive — or about to start TRT — both tests are warranted, in some order, on a defined timeline. If you are not yet in either situation but want a real read on your reproductive health: hormone panel first, semen analysis when the question becomes specific.

We're building both products. The Hormone Panel 01 is live today. Our at-home semen analysis with DFI is targeting Q4 2026; if you want first access, the waitlist is here.

Sources cited: WHO 2021 (semen analysis reference values), Agarwal et al. 2019 (DFI as predictor), ESHRE guideline group — full entries on /science.