When your testosterone lab results come back, the report usually just says "normal" or "abnormal." That binary hides almost all the information you actually need.
Here's how to read your own results like someone who actually understands what they mean — not just whether you cleared a threshold.
The Markers That Actually Matter
A comprehensive testosterone panel includes:
- Total testosterone — the headline number
- Free testosterone — what your body can actually use
- SHBG (sex hormone-binding globulin) — determines how much T is bioavailable
- LH (luteinizing hormone) — tells you if the problem is your brain or your testes
- FSH (follicle-stimulating hormone) — relevant for fertility
- Estradiol (E2) — your estrogen level (yes, men have it, yes it matters)
- Hematocrit — especially important if you're on TRT
Total Testosterone: The Starting Point
The lab reference range is typically 300–1000 ng/dL for adult men. That range was calculated from population data, not from "what level makes men feel good."
Most men report optimal energy, mood, libido, and body composition when total T is between 600–900 ng/dL. If you're at 310 ng/dL, your doctor may say "you're fine" — but you may not feel fine, and you're not wrong.
Key benchmarks: - Under 300: Clinically low. Most physicians treat at this threshold. - 300–450: Low-normal. Many physicians won't treat, but symptoms are common. - 450–600: Functional but suboptimal for many men. - 600–900: Optimal for most men. - Over 1000: Can occur on TRT; monitor for side effects.
Free Testosterone: The Number That Often Matters More
Total testosterone doesn't tell you how much T is actually available to your cells. Most testosterone in your blood is bound to proteins — primarily SHBG and albumin — and is metabolically inactive.
Free testosterone is the unbound fraction that can actually enter cells and exert effects. It's typically 1–3% of total T.
Lab ranges: 9–30 pg/mL (varies by lab). Optimal is often 15–25 pg/mL.
If your total T is 650 but your free T is 8, you may feel like someone with a total T of 300. This is especially common in men with high SHBG.
SHBG: The Hidden Culprit
SHBG is the protein that binds testosterone and takes it out of circulation. High SHBG is a major cause of "normal" total T with low-T symptoms.
What raises SHBG: - Age (SHBG increases with age) - Low insulin / intermittent fasting - Hypothyroidism - Estrogen (including xenoestrogens) - Liver disease - Caloric restriction
Normal range: 10–57 nmol/L. If you're over 40 nmol/L with normal-range total T, your free T is probably low.
LH and FSH: Finding the Source of the Problem
LH tells your testes to produce testosterone. FSH tells them to produce sperm. Testing both tells you where in the system the problem originates.
High LH + Low T = Primary hypogonadism Your brain is sending the signal, but your testes aren't responding. This is a testicular problem.
Low LH + Low T = Secondary hypogonadism Your testes are capable but not getting the signal. This is a pituitary or hypothalamic problem — or, very commonly, the result of obesity, sleep deprivation, high stress, or prior steroid use.
Why this matters: if you have secondary hypogonadism, enclomiphene (which stimulates LH production) may work well without external testosterone. If you have primary hypogonadism, enclomiphene won't help.
Normal LH range: 1.5–9.3 mIU/mL. If low T is present with LH below 3, that's a signal of secondary hypogonadism.
Estradiol: Your Estrogen Level
Men produce estrogen by converting testosterone to estradiol via aromatase. The right estradiol level matters for bone density, libido, mood, and cardiovascular health.
The problem goes both ways: - Too high: Water retention, mood swings, reduced libido, gynecomastia - Too low: Joint pain, dry skin, low libido, depression, poor sleep, bone loss
Optimal range for men: 20–40 pg/mL (using sensitive estradiol assay).
Always test E2 before adding any aromatase inhibitor. Over-suppressing estrogen is its own problem.
Hematocrit: The Safety Marker for TRT Patients
Testosterone stimulates red blood cell production. On TRT, hematocrit can rise. If it gets too high (above 52–54%), blood becomes more viscous and cardiovascular risk increases.
If you're on TRT, check hematocrit every 3–6 months. If it's creeping up, your physician may adjust dose or recommend therapeutic phlebotomy.
Getting the Right Tests
Push for the full panel:
- Total testosterone
- Free testosterone (direct measurement, or calculated from SHBG + albumin)
- SHBG
- LH and FSH
- Sensitive estradiol (specify "sensitive")
- Hematocrit (if on or considering TRT)
- PSA (baseline before TRT, or if over 40)
- CBC and comprehensive metabolic panel
The Bottom Line
"Your testosterone is normal" is the beginning of a conversation, not the end of one. Labs need to be interpreted in context — your symptoms, your free T, your SHBG, your LH pattern.
Optimal health lives between the reference ranges, not just inside them.
Frequently Asked Questions
What is a good testosterone level for a man?
Most labs mark 300-1000 ng/dL as normal, but most men feel best between 600-900 ng/dL. If you're in the 'normal' range but symptomatic, your free testosterone or SHBG may be the issue.
What does high SHBG mean for testosterone?
High SHBG (sex hormone-binding globulin) binds to testosterone and makes it unavailable to your cells. You can have total T of 700 ng/dL but feel like 300 ng/dL if SHBG is elevated. Free T is the number that matters more.
Should I check estradiol with testosterone?
Yes — estradiol (E2) should be tested alongside testosterone, especially if you're on TRT. High estradiol causes water retention, mood changes, and libido issues. Most men do well with E2 between 20-40 pg/mL.
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