Whether it is fatigue that does not resolve with rest, changes in body composition, declining libido, or simply curiosity about where you stand, a male hormone panel can provide answers. Yet the results — total testosterone, free testosterone, SHBG, LH, FSH, estradiol — can be bewildering without context.
This guide walks you through each marker on a male hormone panel, what normal ranges look like, how they interact, and what to do if something is off.
Disclaimer: This information is for educational purposes only and does not replace professional medical advice. Always consult a qualified healthcare provider for diagnosis and treatment.
What Is a Male Hormone Panel?
A male hormone panel is a set of blood tests that evaluates the hypothalamic-pituitary-gonadal (HPG) axis — the hormonal system that controls testosterone production, sperm development, and male reproductive health.
A comprehensive panel typically includes:
- Total testosterone
- Free testosterone (or calculated free testosterone)
- SHBG (sex hormone-binding globulin)
- LH (luteinizing hormone)
- FSH (follicle-stimulating hormone)
- Estradiol (E2)
Some panels also include prolactin, DHEA-S, cortisol, and thyroid function tests depending on the clinical question.
When Is This Panel Ordered?
Common indications include:
- Low libido or erectile dysfunction
- Unexplained fatigue (see blood tests for chronic fatigue)
- Infertility evaluation — as part of a male preconception workup
- Gynecomastia (breast tissue development in men)
- Unexplained muscle loss or inability to gain muscle
- Osteoporosis or low bone density in men
- Monitoring testosterone replacement therapy (TRT)
- Age-related screening — particularly after age 40 when testosterone naturally declines
Total Testosterone
What It Measures
Total testosterone includes all testosterone in the bloodstream: free testosterone, testosterone bound to albumin, and testosterone tightly bound to SHBG.
Normal Ranges
According to the Endocrine Society and most US reference laboratories:
| Age Group |
Total Testosterone (ng/dL) |
SI Equivalent (nmol/L) |
| Men 19–39 years |
264–916 |
9.2–31.8 |
| Men 40–59 years |
200–870 |
6.9–30.2 |
| Men 60+ years |
170–780 |
5.9–27.1 |
Key considerations:
- Morning samples are essential: Testosterone peaks between 7–9 AM and can drop 20–30% by afternoon. The Endocrine Society requires two morning samples below 300 ng/dL to diagnose hypogonadism.
- Obesity lowers total testosterone: Excess adipose tissue increases aromatase activity (converting testosterone to estradiol) and raises SHBG suppression, creating a compounding effect.
- Lab variation: Quest Diagnostics, LabCorp, and Synlab may use slightly different reference ranges depending on the assay platform (LC-MS/MS is the gold standard).
Free Testosterone
Why It Matters
Only 1–3% of total testosterone circulates freely — the rest is bound. Free testosterone is the biologically active fraction that directly enters cells and activates androgen receptors.
How It Is Measured
- Direct measurement (equilibrium dialysis or ultrafiltration) — the gold standard but expensive and not widely available
- Calculated free testosterone — using the Vermeulen equation from total testosterone, SHBG, and albumin. This is what most laboratories report.
Normal Ranges
- Men under 50: 6.5–25.0 pg/mL (225–867 pmol/L)
- Men over 50: 5.0–19.0 pg/mL (173–659 pmol/L)
A man with normal total testosterone but high SHBG may have low free testosterone — and experience all the symptoms of hypogonadism. This is why both measurements are essential.
SHBG (Sex Hormone-Binding Globulin)
What It Does
SHBG is a transport protein produced by the liver that binds testosterone (and estradiol) in the bloodstream. It regulates how much hormone is available to tissues.
Normal Range
- Men: 10–57 nmol/L (most functional range: 20–40 nmol/L)
What Abnormal SHBG Means
High SHBG (more testosterone bound, less available):
- Aging, hyperthyroidism, liver disease, anticonvulsants, estrogen use
- Results in low free testosterone despite normal total testosterone
Low SHBG (less binding, but often reflects underlying metabolic issues):
- Obesity, insulin resistance, type 2 diabetes, hypothyroidism, nephrotic syndrome, anabolic steroid use
- May mask true testosterone deficiency on total testosterone testing
LH (Luteinizing Hormone)
Role in Male Physiology
LH is produced by the pituitary gland and directly stimulates Leydig cells in the testes to produce testosterone. It is the brain's signal to the testes.
Normal Range
- Men: 1.5–9.3 mIU/mL (IU/L)
Diagnostic Value
LH is crucial for distinguishing primary from secondary hypogonadism:
- High LH + low testosterone = Primary hypogonadism — the testes are failing, and the pituitary is compensating by increasing LH. Causes: Klinefelter syndrome, testicular injury, orchitis, chemotherapy, aging.
- Low or normal LH + low testosterone = Secondary hypogonadism — the problem is in the pituitary or hypothalamus. Causes: pituitary tumors (prolactinoma), obesity, opioid use, sleep apnea, head trauma, anabolic steroid abuse.
FSH (Follicle-Stimulating Hormone)
Role in Male Physiology
FSH stimulates Sertoli cells in the seminiferous tubules, which are essential for sperm production (spermatogenesis).
Normal Range
- Men: 1.0–12.0 mIU/mL (IU/L)
Diagnostic Value
- Elevated FSH — suggests testicular damage to the seminiferous tubules (impaired spermatogenesis). Common with Klinefelter syndrome, varicocele, prior chemotherapy, or idiopathic infertility.
- Low FSH — indicates pituitary or hypothalamic dysfunction (secondary hypogonadism).
- FSH combined with semen analysis gives the most complete picture of male fertility. See our semen analysis interpretation guide.
Estradiol (E2)
Why Test Estradiol in Men?
Men produce estradiol through aromatase conversion of testosterone in fat tissue, liver, and brain. A proper testosterone-to-estradiol balance is essential.
Normal Range
- Men: 10–40 pg/mL (37–147 pmol/L)
Abnormal Levels
High estradiol in men:
- Obesity (more fat = more aromatase activity)
- Liver disease (impaired estrogen metabolism)
- Exogenous testosterone without aromatase inhibitor
- Symptoms: gynecomastia, water retention, mood changes, erectile dysfunction
Low estradiol in men:
- Excessive aromatase inhibitor use
- Symptoms: joint pain, decreased bone density, low libido (estradiol is needed for bone health and sexual function even in men)
Putting It All Together: Interpretation Patterns
| Pattern |
Total T |
Free T |
LH |
FSH |
Interpretation |
| Normal |
Normal |
Normal |
Normal |
Normal |
No hormonal issue |
| Primary hypogonadism |
Low |
Low |
High |
High |
Testicular failure |
| Secondary hypogonadism |
Low |
Low |
Low/Normal |
Low/Normal |
Pituitary/hypothalamic cause |
| High SHBG effect |
Normal |
Low |
Normal |
Normal |
Functional deficiency |
| Obesity-related |
Low-normal |
Low |
Low-normal |
Normal |
Metabolic suppression |
| Anabolic steroid use |
High* |
High |
Suppressed |
Suppressed |
Exogenous source |
*If using exogenous testosterone, total T may be high while LH and FSH are profoundly suppressed.
How to Prepare for Hormone Testing
For accurate results, follow these preparation recommendations:
- Test between 7–10 AM — testosterone is highest in the morning
- Fasting is preferred — insulin spikes can acutely lower testosterone
- Avoid heavy exercise for 24 hours before the test
- Get adequate sleep the night before — sleep deprivation can suppress testosterone by 10–15%
- Disclose all medications — especially opioids, corticosteroids, and supplements
Treatment Approaches
If your panel confirms hypogonadism, treatment options include:
- Testosterone replacement therapy (TRT) — injections, gels, patches, or pellets. Improves energy, libido, muscle mass, and mood, but suppresses fertility.
- Clomiphene citrate — stimulates LH and FSH production; preserves fertility (off-label but widely used)
- hCG injections — stimulates testicular testosterone production directly; often used alongside TRT to maintain fertility and testicular volume
- Lifestyle optimization — weight loss, exercise, sleep improvement, stress reduction
- Addressing underlying causes — treating sleep apnea, discontinuing opioids, managing prolactinoma
Related Tests and Articles
Get Your Results Interpreted
If you have a male hormone panel and want a clear, personalized explanation of every value — testosterone, SHBG, LH, FSH, estradiol — upload your results at Evallume for an instant AI-powered interpretation that considers your age, symptoms, and clinical context.
This article is for informational purposes only. It does not constitute medical advice, diagnosis, or treatment. Consult a healthcare professional for any medical concerns.
