Performance labs for men: The blood tests and biomarkers that matter

For men, the performance labs that matter most are morning blood tests that can explain symptoms and guide action, especially free testosterone below 100 pg/mL, and the LH plus FSH pattern that shows whether the problem starts in the testes or higher in the hormone axis. Add practical biomarkers such as CBC, Comprehensive Metabolic Panel, estradiol, PSA after age 40, and trend data from wearables, and health monitoring becomes useful instead of obsessive.

Key takeaways

• A hormone workup is most informative when testosterone is measured in a fasting morning sample and a low result is confirmed with a second morning draw. A diagnosis needs both symptoms and consistently low levels.^[1]
• LH and FSH belong alongside testosterone because high LH plus low testosterone points to primary hypogonadism, while low or normal LH plus low testosterone suggests secondary or functional hypogonadism. That distinction decides whether a treatment that raises the body’s own LH, such as enclomiphene, can work at all.
• Consumer wearables are useful for trends in step count and activity, but systematic reviews show they are less dependable for calorie burn and sleep detail than many users assume.^{[2] [3]}
• Free testosterone matters most when total testosterone is near the lower limit of normal or SHBG is altered, and the Endocrine Society guideline calls for equilibrium dialysis or an accurate formula in those cases.^[1]
• A 2004 clinic study found hypogonadotropic hypogonadism in about one third of men with type 2 diabetes, which is one reason performance labs should include metabolic blood tests and not just gym metrics.^[4]

Why performance labs matter

Performance labs matter because blood tests and wearables measure different parts of the same system. Blood biomarkers show what is happening inside the body at the molecular level, while wearables capture day to day output such as resting heart rate, sleep time, pace, and estimated VO2 max.

For men, that distinction matters most when symptoms do not match the surface data. A man can still hit his steps, close his rings, and train four days a week while losing libido, morning erections, strength, or recovery. In the European Male Ageing Study, a 2010 New England Journal of Medicine analysis of 3,369 men aged 40 to 79, late-onset hypogonadism was defined by at least three sexual symptoms together with total testosterone below 11 nmol/L (320 ng/dL) and free testosterone below 220 pmol/L (64 pg/mL), not by a low lab number alone.^[5] According to the Endocrine Society guideline, male hypogonadism should be diagnosed only in men who have symptoms and signs of testosterone deficiency together with consistently low testosterone levels.^[1]

Which biomarkers belong in performance labs

The right performance labs for men focus on hormone signaling, metabolic health, and safety markers that can actually change decisions.

Testosterone and free testosterone

Total testosterone and free testosterone are the core blood tests when a man has low libido, erection changes, fatigue, loss of strength, or poor recovery. Free testosterone is the fraction of testosterone not tightly bound to proteins and available to tissues. According to the Endocrine Society guideline, free testosterone should be measured by equilibrium dialysis or estimated with an accurate formula in men whose total testosterone is near the lower limit of normal or who have a condition that alters SHBG, the main binding protein.^[1] A 2007 Endocrine Society position statement on testosterone measurement reviewed the limitations and pitfalls of clinical testosterone assays and called for laboratories to be judged on whether they measure known testosterone concentrations accurately.^[6] Liquid chromatography with tandem mass spectrometry (LC-MS/MS) is the more accurate method for total testosterone.

Timing matters. According to the Endocrine Society guideline, testosterone should be measured in the morning in a fasting state, and a low result should be confirmed with a second morning measurement before hypogonadism is diagnosed.^[1] Testosterone runs highest in the morning, so a later draw can make a normal level look low.

LH and FSH

LH and FSH are gonadotropins, pituitary signals that tell the testes to produce testosterone and support sperm production. The Endocrine Society guideline calls for further evaluation of the cause once testosterone deficiency is confirmed, and LH and FSH are what separate primary versus secondary hypogonadism, which in turn determines the treatment path.^[1]

High LH plus low testosterone suggests primary hypogonadism, where the testes are failing to respond. Low or normal LH plus low testosterone suggests secondary or functional hypogonadism, where signaling is suppressed higher up the axis and the testes can still respond. That is the group in which enclomiphene, a drug that raises the body’s own LH rather than replacing testosterone from the outside, can be considered. It would not help primary hypogonadism.

Estradiol, prolactin, and thyroid when needed

Estradiol is a form of estrogen that men also make, mainly by converting testosterone in fat tissue. In a 2013 New England Journal of Medicine study that suppressed healthy men’s own hormone production and then replaced testosterone at different doses, with or without blocking its conversion to estradiol, low estradiol accounted for most of the increase in body fat, and both low testosterone and low estradiol contributed to declining sexual function.^[7] Prolactin is a pituitary hormone that can suppress GnRH, the brain signal that starts the testosterone cascade, so it becomes relevant when testosterone is low and LH and FSH are not appropriately elevated.

TSH, the main thyroid screening marker, is not needed for every man, but it is useful when fatigue, weight change, mood symptoms, or unexplained low energy suggest a thyroid problem.

Safety and performance markers beyond hormones

Performance labs should also include safety markers that explain why a man feels worse, recovers poorly, or may not be a candidate for certain treatments. A practical core set includes a CBC, Comprehensive Metabolic Panel, vitamin D, PSA for men age 40 and older, and fasting insulin when BMI is above 25, with a lipid panel, prolactin, or thyroid testing added when clinically indicated.

CBC measures blood cells, including hematocrit, and the Endocrine Society guideline lists elevated hematocrit as a reason not to start testosterone therapy and calls for monitoring it during treatment.^[1] The same guideline advises against starting testosterone therapy without further urological evaluation when PSA is above 4 ng/mL, or above 3 ng/mL in men at higher risk of prostate cancer.^[1] The Comprehensive Metabolic Panel checks liver enzymes, kidney function, electrolytes, and glucose. In men with type 2 diabetes, low testosterone is common enough that skipping metabolic blood tests can miss the real reason a man’s performance is slipping.^[4] When free testosterone is measured directly by equilibrium dialysis, a separate SHBG result is not needed to calculate it.

What wearables can and cannot tell you

Wearables are best for trend spotting, not diagnosis. A 2015 systematic review of Fitbit and Jawbone trackers found high validity for step counts, few studies on distance and physical activity, and lower validity for energy expenditure and sleep, with energy expenditure more often underestimated.^[2]

Sleep data has similar limits. A 2019 meta-analysis of wristband Fitbit models found that older devices relying on movement alone overestimated total sleep time and sleep efficiency, underestimated time awake after falling asleep, and had low specificity for detecting wakefulness.^[3] Newer sleep-staging models that also use heart rate variability performed better, but the authors concluded they give only gross estimates and are not a substitute for polysomnography, the formal sleep study.^[3] A wearable is helpful for long-term health monitoring, but it does not replace blood tests or a clinical evaluation.

What abnormal biomarkers can point to

Abnormal performance labs can point to metabolic disease, pituitary signaling problems, testicular failure, sleep-related strain, and higher cardiovascular risk. A low sleep score from a wearable can be a clue, but it is not proof of hormone deficiency, and evidence is mixed on how much treating poor sleep alone raises testosterone.

Type 2 diabetes and insulin resistance. A 2004 study of men with type 2 diabetes attending a diabetes clinic, published in the Journal of Clinical Endocrinology and Metabolism, found that about one third had low free testosterone with low or normal LH and FSH, the pattern of hypogonadotropic hypogonadism.^[4] Low testosterone can therefore be a metabolic warning sign, not just a sex hormone issue. Men with more abdominal fat, higher fasting insulin, and worse glucose control are also more likely to show the low or normal LH pattern typical of functional suppression. Diabetes affects erections as well: a 2022 review reported that erectile dysfunction is about 3.5 times more common in men with diabetes than in men without it.^[8]

Primary versus secondary hypogonadism. High LH with low testosterone suggests the testes are not responding. Low or normal LH with low testosterone suggests the brain is not sending a strong enough signal. The treatment is not the same in both cases, and the Endocrine Society guideline recommends looking for the cause once deficiency is confirmed rather than treating the number alone.^[1]

Cardiovascular risk. A 2011 meta-analysis in the European Journal of Endocrinology found that men with cardiovascular disease had lower testosterone, and that baseline testosterone was lower in men who later died of any cause or of cardiovascular causes, although the authors noted it is still unclear whether low testosterone causes this risk or only accompanies it.^[9] Low testosterone often coexists with obesity, diabetes, and low fitness, so useful health monitoring includes blood pressure, lipids when indicated, glucose markers, and training capacity, not just hormone biomarkers.

Fertility and sexual health. Low testosterone with abnormal LH or FSH can accompany impaired sperm production, lower libido, and erectile problems. It also changes treatment choices. The Endocrine Society guideline recommends against starting testosterone therapy in men planning fertility in the near term.^[1] External testosterone suppresses LH, FSH, and sperm production. By contrast, enclomiphene can raise the body’s own testosterone in men with secondary or functional hypogonadism while preserving testicular function.

Signs your health monitoring is finding something real

Repeated patterns matter more than a single bad day, especially when symptoms line up with abnormal blood tests or a clear drift in wearable data. In the European Male Ageing Study, poor morning erections, low sexual desire, and erectile dysfunction were the symptoms most consistently tied to low testosterone,^[5] and the Endocrine Society guideline asks for consistently low levels on repeat morning testing before a diagnosis is made.^[1]

• You are sleeping about the same number of hours, but your resting heart rate is running 5 to 10 beats per minute above baseline for more than a week and workouts feel harder at the same pace.
• Your libido is down for several weeks, not just after one stressful work stretch, and morning erections are less frequent or weaker than your usual baseline.
• Your body weight is stable, but your waist is growing, your lifts are stalling, and recovery between hard sessions is worse despite similar protein and calorie intake.
• Your estimated VO2 max or pace at a familiar heart rate is dropping over a month or two, and the decline is paired with lower motivation, poorer sleep quality, or more afternoon fatigue.
• You are feeling mentally flat, less assertive, or more irritable, and the change arrived with lower sex drive and slower gym progress rather than as a pure mood issue.
• Your smartwatch keeps flagging poor recovery, and you notice the same thing in daily life: less drive, less morning energy, less training output, and more brain fog.
• You have erection changes or reduced ejaculate volume along with lower desire, especially if you are also dealing with obesity, diabetes, sleep apnea, or certain medications.
• You have been adding supplements every few weeks to fix fatigue, but you have never had a targeted set of blood tests to check hormones, metabolic strain, liver function, or blood counts.

Myth vs fact

Myth: More biomarkers always make better performance labs

Fact: A targeted panel is more useful than a large untargeted one. Male hypogonadism requires symptoms plus consistently low testosterone, and once deficiency is confirmed, the Endocrine Society guideline calls for evaluating its cause.^{[1] [5]} LH and FSH are the tests that make that classification. Adding more markers does not make up for missing the few that change diagnosis and treatment.

Myth: Wearables can diagnose hormone problems

Fact: Wearables can flag trends, but they do not diagnose endocrine disorders. Systematic reviews show good validity for step counts and reasonable sleep detection in newer devices, but weaker accuracy for energy expenditure and limited ability to detect time awake.^{[2] [3]}

Myth: A normal total testosterone means you are definitely fine

Fact: Not always. Free testosterone can reveal a clinically relevant problem when total testosterone looks borderline. According to the Endocrine Society guideline, men whose total testosterone is near the lower limit of normal, or who have a condition that changes SHBG, should have free testosterone measured by equilibrium dialysis or estimated with an accurate formula.^[1] An Endocrine Society position statement on testosterone assays also stressed that labs should be judged on measuring known testosterone concentrations accurately, so the method behind a result matters.^[6]

Myth: TRT is the standard fix for any low testosterone result

Fact: Testosterone therapy is for documented, symptomatic hypogonadism, not an optimization tool for men with normal testosterone. The Endocrine Society guideline recommends against starting it in men planning fertility in the near term.^[1] A 2023 New England Journal of Medicine trial (TRAVERSE) in 5,246 men aged 45 to 80 with hypogonadism and existing or high cardiovascular risk found testosterone gel noninferior to placebo for major cardiovascular events over a mean follow-up of 33 months, although atrial fibrillation, acute kidney injury, and pulmonary embolism were more frequent with testosterone.^[10] For men with secondary or functional hypogonadism, options that raise the body’s own testosterone production are also worth discussing.

How to use performance labs without obsessing

Use performance labs to answer a specific question, match the numbers to symptoms, and repeat tests only when the result could change what you do next.

1. Step 1: Start with a real baseline. Get morning blood tests between 07:00 and 11:00, ideally fasting, before changing three supplements at once. For hormone symptoms, that means total testosterone by LC-MS/MS, free testosterone by equilibrium dialysis or an accurate calculation, LH, FSH, estradiol, CBC, Comprehensive Metabolic Panel, vitamin D, PSA if you are 40 or older, and fasting insulin if BMI is above 25.
2. Step 2: Pair your blood tests with 30 days of simple health monitoring. Track sleep duration, resting heart rate, body weight, waist size, training output, libido, erection quality, and energy. If testosterone comes back low and symptoms persist, the Endocrine Society guideline recommends confirming it with a second morning draw before diagnosing hypogonadism or starting treatment.^[1] The next question is classification. High LH points toward primary hypogonadism. Low or normal LH points toward secondary or functional hypogonadism, where weight, sleep, medications, and metabolic health matter, and where treatments that raise the body’s own LH, such as enclomiphene, preserve sperm production in a way testosterone therapy does not.
3. Step 3: Retest on a schedule, not on impulse. For men on testosterone therapy, the Endocrine Society guideline calls for checking symptoms, side effects, testosterone, hematocrit, and prostate cancer risk during the first year.^[1] With any treatment, ongoing monitoring shows whether symptoms, biomarkers, and day to day performance are moving in the same direction.

Veedma offers a diagnostic workup that includes total and free testosterone measured by LC-MS/MS with LH and FSH, or a review of existing labs, interpreted by licensed providers. In Veedma’s protocol, enclomiphene is the first option for secondary or functional hypogonadism when symptoms persist and free testosterone is below 100 pg/mL, with the enclomiphene plus tadalafil tablet when erection or urinary symptoms are also present. Enclomiphene is not an FDA-approved drug; it is prescribed after a provider confirms the diagnosis and is compounded by a licensed U.S. pharmacy.

The bottom line on performance labs for men

The blood tests and biomarkers that matter most for men are the ones that explain symptoms and change decisions: morning total testosterone, accurately measured free testosterone, LH, FSH, estradiol, CBC, Comprehensive Metabolic Panel, vitamin D, PSA when age appropriate, and insulin when body composition suggests metabolic strain. Wearables are useful for trend tracking, but diagnosis still depends on blood tests read alongside symptoms.

References

1. Bhasin S, Brito JP, Cunningham GR, et al. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2018;103:1715-1744. PMID: 29562364
2. Evenson KR, Goto MM, Furberg RD. Systematic review of the validity and reliability of consumer-wearable activity trackers. Int J Behav Nutr Phys Act. 2015;12:159. PMID: 26684758
3. Haghayegh S, Khoshnevis S, Smolensky MH, et al. Accuracy of Wristband Fitbit Models in Assessing Sleep: Systematic Review and Meta-Analysis. J Med Internet Res. 2019;21:e16273. PMID: 31778122
4. Dhindsa S, Prabhakar S, Sethi M, et al. Frequent occurrence of hypogonadotropic hypogonadism in type 2 diabetes. J Clin Endocrinol Metab. 2004;89:5462-8. PMID: 15531498
5. Wu FC, Tajar A, Beynon JM, et al. Identification of late-onset hypogonadism in middle-aged and elderly men. N Engl J Med. 2010;363:123-35. PMID: 20554979
6. Rosner W, Auchus RJ, Azziz R, et al. Position statement: Utility, limitations, and pitfalls in measuring testosterone: an Endocrine Society position statement. J Clin Endocrinol Metab. 2007;92:405-13. PMID: 17090633
7. Finkelstein JS, Lee H, Burnett-Bowie SA, et al. Gonadal steroids and body composition, strength, and sexual function in men. N Engl J Med. 2013;369:1011-22. PMID: 24024838
8. Defeudis G, Mazzilli R, Tenuta M, et al. Erectile dysfunction and diabetes: A melting pot of circumstances and treatments. Diabetes Metab Res Rev. 2022;38:e3494. PMID: 34514697
9. Corona G, Rastrelli G, Monami M, et al. Hypogonadism as a risk factor for cardiovascular mortality in men: a meta-analytic study. Eur J Endocrinol. 2011;165:687-701. PMID: 21852391
10. Lincoff AM, Bhasin S, Flevaris P, et al. Cardiovascular Safety of Testosterone-Replacement Therapy. N Engl J Med. 2023;389:107-117. PMID: 37326322