Advanced Hormone Testing for Men: Beyond Testosterone

Why Standard Testosterone Testing Misses Most of the Picture

When a man complains of fatigue, low libido, brain fog, poor recovery, or declining muscle mass, the standard medical response is to check total testosterone. If it falls within the reference range — typically 300 to 1,000 ng/dL — the conversation often ends there. But total testosterone is one data point in a complex hormonal ecosystem. A man with a total testosterone of 450 ng/dL and elevated SHBG may have the free testosterone of someone at 250 ng/dL. A man with normal testosterone but suppressed growth hormone, elevated prolactin, or dysregulated cortisol will experience every symptom of hormonal dysfunction despite a “normal” lab result.

This guide covers the complete male hormonal panel — every hormone that meaningfully influences male physiology, what optimal levels look like, what drives them out of range, and how to interpret the full picture rather than a single number.

The Testosterone Axis: Total, Free, and Bioavailable

Total Testosterone

Total testosterone measures all testosterone in the blood, including testosterone bound to sex hormone-binding globulin (SHBG) and albumin, plus the small fraction that is free. The conventional reference range (300 to 1,000 ng/dL) is population-derived and does not reflect optimal function. Most men feel and perform best with total testosterone in the 600 to 900 ng/dL range. Values below 400 ng/dL are associated with fatigue, reduced libido, loss of muscle mass, increased body fat, depression, and cognitive decline — even when technically “normal.”

Free Testosterone

Only 1 to 3% of total testosterone is free — unbound and biologically active. Free testosterone is the fraction that actually enters cells and exerts androgenic effects. Optimal free testosterone: 15 to 25 pg/mL (or 5 to 9 ng/dL depending on the assay). Many men with normal total testosterone have low free testosterone due to elevated SHBG, which binds testosterone tightly and renders it biologically unavailable. Free testosterone should always be measured alongside total testosterone.

Sex Hormone-Binding Globulin (SHBG)

SHBG is a glycoprotein produced by the liver that binds testosterone (and estradiol) with high affinity. Elevated SHBG reduces free testosterone availability even when total testosterone is normal. SHBG rises with aging, hyperthyroidism, liver disease, caloric restriction, and high-fiber diets. It falls with insulin resistance, obesity, hypothyroidism, and anabolic steroid use. Optimal SHBG for men: 20 to 40 nmol/L. Values above 60 nmol/L significantly impair free testosterone availability.

Bioavailable Testosterone

Bioavailable testosterone includes free testosterone plus albumin-bound testosterone (which is loosely bound and readily dissociates). It represents the total fraction available to tissues. Optimal bioavailable testosterone: 130 to 300 ng/dL. This metric is particularly useful when SHBG is elevated and free testosterone is borderline.

Estradiol: The Hormone Men Are Not Told to Check

Estradiol (E2) is not just a female hormone — it is essential for male bone density, cardiovascular health, libido, cognitive function, and joint health. Men produce estradiol primarily through aromatization of testosterone in adipose tissue, liver, and brain. Optimal estradiol for men: 20 to 30 pg/mL. Both deficiency and excess cause problems.

Low estradiol (below 15 pg/mL) causes joint pain, low libido, poor bone density, and mood disturbance. High estradiol (above 40 pg/mL) causes gynecomastia, water retention, reduced libido, and suppression of the hypothalamic-pituitary-gonadal (HPG) axis. Elevated estradiol in men is most commonly driven by excess adipose tissue (which contains high aromatase activity), alcohol consumption, and certain medications. The testosterone-to-estradiol ratio is as important as either value in isolation.

Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH)

LH and FSH are pituitary hormones that regulate testicular function. LH stimulates Leydig cells to produce testosterone; FSH stimulates Sertoli cells and spermatogenesis. Measuring LH and FSH alongside testosterone allows differentiation between primary hypogonadism (testicular failure — low testosterone with high LH/FSH) and secondary hypogonadism (pituitary or hypothalamic dysfunction — low testosterone with low or normal LH/FSH). This distinction is critical for treatment decisions. Optimal LH: 2 to 8 IU/L. Optimal FSH: 2 to 8 IU/L.

Growth Hormone and IGF-1

Growth hormone (GH) is secreted by the pituitary gland in pulsatile bursts, primarily during deep sleep. Because GH is pulsatile and has a short half-life, serum GH levels are not clinically useful for routine assessment. Instead, IGF-1 (insulin-like growth factor 1) — produced by the liver in response to GH stimulation — is the standard clinical proxy for GH status. IGF-1 reflects integrated GH secretion over days to weeks and is stable throughout the day.

Why IGF-1 Matters

GH and IGF-1 drive protein synthesis, fat metabolism, bone density, muscle mass, and tissue repair. GH deficiency in adults produces a characteristic syndrome of increased visceral fat, reduced muscle mass, fatigue, impaired cognitive function, poor sleep quality, and reduced quality of life — a syndrome that overlaps substantially with low testosterone and is frequently missed when only testosterone is checked. IGF-1 declines with age, poor sleep, caloric restriction, and insulin resistance. Optimal IGF-1 varies by age: for men aged 30 to 40, optimal is approximately 150 to 250 ng/mL; for men aged 50 to 60, approximately 100 to 200 ng/mL. Values in the lower quartile for age are associated with increased cardiovascular risk and all-cause mortality.[1]

Optimizing GH and IGF-1 Naturally

The most powerful natural stimulants of GH secretion are deep sleep (GH is primarily secreted during slow-wave sleep), high-intensity exercise (resistance training and sprint intervals produce acute GH surges), intermittent fasting (GH rises dramatically during fasting to preserve muscle mass), and protein adequacy (IGF-1 production requires sufficient dietary protein). Chronic sleep deprivation, obesity, insulin resistance, and sedentary behavior all suppress GH secretion and IGF-1 production.

Prolactin

Prolactin is a pituitary hormone best known for stimulating milk production in women, but it plays important roles in male reproductive and immune function. Elevated prolactin in men — hyperprolactinemia — suppresses the HPG axis, reducing LH, FSH, and testosterone production. It is a frequently overlooked cause of secondary hypogonadism. Optimal prolactin for men: 2 to 15 ng/mL. Values above 25 ng/mL warrant investigation for a pituitary adenoma (prolactinoma), which is the most common pituitary tumor and is highly treatable.

Causes of mildly elevated prolactin include stress, hypothyroidism, certain medications (antipsychotics, antidepressants, metoclopramide, opioids), and vigorous exercise immediately before blood draw. Symptoms of hyperprolactinemia include low libido, erectile dysfunction, infertility, gynecomastia, and fatigue — all symptoms commonly attributed to low testosterone without checking prolactin.

DHEA-S: The Adrenal Androgen

Dehydroepiandrosterone sulfate (DHEA-S) is the most abundant circulating steroid hormone in the body and serves as a precursor to both testosterone and estrogen. Produced by the adrenal glands, DHEA-S peaks in the mid-20s and declines approximately 2% per year thereafter — one of the most consistent biomarkers of biological aging. Optimal DHEA-S for men under 50: 200 to 400 µg/dL; for men 50 to 65: 150 to 300 µg/dL. Low DHEA-S is associated with fatigue, reduced libido, depression, immune dysfunction, and accelerated aging. DHEA-S is also a useful marker of adrenal reserve and chronic stress burden.

Cortisol: The Hormone That Suppresses Everything Else

Cortisol is the primary stress hormone, produced by the adrenal cortex in response to ACTH from the pituitary. Chronically elevated cortisol — from psychological stress, poor sleep, overtraining, or HPA axis dysregulation — suppresses testosterone production, reduces IGF-1, impairs thyroid conversion, and drives insulin resistance. Optimal AM serum cortisol: 15 to 20 µg/dL. A 4-point salivary cortisol test (morning, noon, afternoon, evening) provides a more complete picture of the diurnal cortisol rhythm than a single AM draw. A flattened cortisol curve — where morning cortisol is low and evening cortisol is elevated — is associated with burnout, chronic fatigue, and poor sleep quality.

Thyroid Hormones and Male Hormonal Health

Thyroid dysfunction profoundly affects male hormonal health and is frequently overlooked in the context of low testosterone evaluation. Hypothyroidism raises SHBG (reducing free testosterone), impairs GH secretion, elevates prolactin, and causes fatigue, weight gain, and cognitive symptoms that mimic hypogonadism. Hyperthyroidism raises SHBG and can cause gynecomastia through increased aromatization. A full thyroid panel — TSH, Free T3, Free T4, Reverse T3, and thyroid antibodies — should be part of every comprehensive male hormonal evaluation. For optimal ranges, see our companion guide: Beyond the Basic Panel: The Complete Guide to Advanced Blood Work and Lab Testing.

Insulin and Metabolic Hormones

Insulin resistance is one of the most common and underappreciated drivers of male hormonal dysfunction. Hyperinsulinemia suppresses SHBG (paradoxically increasing total testosterone while reducing its quality), promotes aromatization of testosterone to estradiol in adipose tissue, and impairs pituitary GH secretion. Fasting insulin (optimal 2 to 5 µIU/mL), HbA1c (optimal below 5.3%), and the triglyceride:HDL ratio (optimal below 1.5) should be part of every comprehensive male hormonal evaluation. Addressing insulin resistance through diet, exercise, and targeted supplementation often produces dramatic improvements in the full hormonal profile without any direct hormonal intervention.

The Complete Male Hormonal Panel

Tier 1 — Essential: Total testosterone, free testosterone, SHBG, estradiol (sensitive assay), LH, FSH, prolactin, DHEA-S, AM cortisol, TSH, Free T3, Free T4, fasting insulin, HbA1c.

Tier 2 — Comprehensive: IGF-1, bioavailable testosterone, Reverse T3, thyroid antibodies (TPO, thyroglobulin), 4-point salivary cortisol, ACTH, PSA (men over 40), complete metabolic panel, CBC, ApoB, hs-CRP.

Tier 3 — Advanced: Pregnenolone, progesterone, androstenedione, DHT (dihydrotestosterone), sex hormone panel by LC-MS/MS (gold standard assay), growth hormone stimulation test (if IGF-1 is low), pituitary MRI (if prolactin is elevated above 25 ng/mL).

Interpreting the Full Picture

Hormones do not operate in isolation — they form an interconnected network where each hormone influences the others. A man with low testosterone, elevated estradiol, elevated prolactin, low DHEA-S, and elevated cortisol has a very different clinical picture than a man with isolated low testosterone. The former suggests a systemic stress and metabolic dysfunction pattern; the latter may reflect primary testicular insufficiency or a specific nutritional deficiency. Effective hormonal optimization requires understanding the full network, not just treating the most obvious abnormality.

For a comprehensive framework integrating hormonal testing with advanced cardiovascular, metabolic, and longevity diagnostics, see our guide: Longevity Diagnostics: The Advanced Screening Tools That Go Beyond Standard Medicine.

Related Reading

• Beyond the Basic Panel: The Complete Guide to Advanced Blood Work and Lab Testing
• Longevity Diagnostics: The Advanced Screening Tools That Go Beyond Standard Medicine
• Heart Rate Variability (HRV): The Nervous System Metric That Predicts Everything

References

1. Rosen T, Bengtsson BA. Premature Mortality Due to Cardiovascular Disease in Hypopituitarism. The Lancet. 1990;336(8710):285-288.
2. Bhasin S, et al. Testosterone Therapy in Men with Hypogonadism: An Endocrine Society Clinical Practice Guideline. Journal of Clinical Endocrinology and Metabolism. 2018;103(5):1715-1744.
3. Veldhuis JD, et al. Endocrine Control of Body Composition in Infancy, Childhood, and Puberty. Endocrine Reviews. 2005;26(1):114-146.
4. Molitch ME. Diagnosis and Treatment of Pituitary Adenomas. JAMA. 2017;317(5):516-524.
5. Laughlin GA, Barrett-Connor E. Sexual Dimorphism in the Influence of Advanced Aging on Adrenal Hormone Levels. Journal of Clinical Endocrinology and Metabolism. 2000;85(10):3561-3568.
6. Leproult R, Van Cauter E. Effect of 1 Week of Sleep Restriction on Testosterone Levels in Young Healthy Men. JAMA. 2011;305(21):2173-2174.