Total Testosterone
The total testosterone in circulation — both the fraction bound to carrier proteins (SHBG, albumin) and the small free fraction. It's the headline number on every hormone panel and, on its own, an incomplete picture.
Testosterone drives muscle protein synthesis, bone density, red blood cell production, libido, mood, cognition and metabolic health. In women it's equally essential — for libido, lean mass, bone and mood — just at roughly a tenth the concentration.
The plan of attack
In this order. Most people start at step four, which is why they change five things at once and learn nothing.
- Confirm the number is real
Immunoassay vs LC/MS. Direct immunoassays are unreliable at the low end and in women. LC-MS/MS is the reference method. Ask for LC/MS where the number will drive a decision. - Read it with its partner
Always order with free T, SHBG, LH/FSH and sensitive estradiol — total T alone is close to meaningless. Draw fasted between 7–10am, when levels peak. Draw it alongside: Free Testosterone, SHBG (Sex Hormone-Binding Globulin), LH & FSH. - Work out which direction is yours
If it's high — In men: exogenous testosterone/AAS, or high SHBG masking low free T. In women: PCOS, adrenal tumor, or over-supplementation — presents as acne, scalp hair loss, hirsutism, cycle irregularity.
If it's low — Fatigue, low libido, poor recovery, loss of muscle and bone, depressed mood, insulin resistance, poor erections in men. - Fix it in this order
Nutrition. Get to a healthy body-fat range — this is the single biggest lever in men, since adipose tissue converts testosterone to estradiol. Don't chronically under-eat: sustained deficits below ~15% of maintenance suppress the HPG axis. Adequate dietary fat (~0.3–0.4 g/lb) supports steroidogenesis; very-low-fat diets measurably lower testosterone.
Lifestyle. Sleep 7–9h — restricting to 5h drops testosterone 10–15% in a week. Resistance train with compound lifts. Treat sleep apnea if you snore or wake unrefreshed. Cut alcohol. Manage chronic stress and avoid excessive endurance volume.
Supplements. Correct deficiencies rather than chasing 'boosters': vitamin D to 40–60 ng/mL, zinc if low, magnesium glycinate, boron (modestly lowers SHBG, raising free T). Ashwagandha (KSM-66) has the best trial support — largely via cortisol reduction. Tongkat ali shows modest signal. Most 'test boosters' do nothing in replete men.
Hormones. If genuinely deficient and symptomatic: TRT under medical supervision, or enclomiphene/hCG/gonadorelin to stimulate your own production (preserving fertility and testicular volume). The choice depends entirely on whether the problem is primary or secondary — which LH/FSH answers.
Compounds. No peptide directly raises testosterone. hCG mimics LH; gonadorelin stimulates pituitary LH/FSH release. GH-axis peptides (ipamorelin, CJC-1295, sermorelin, tesamorelin) do not raise testosterone — a persistent myth.
Work down the list, not across it. Adding a compound on top of an unfixed diet is why generic protocols fail. - Retest
6–8 weeks after any protocol change; every 3–6 months on TRT. Change one thing at a time, or the retest can't tell you which thing worked.
How to fix it
📚 Travison TG et al., J Clin Endocrinol Metab 2017;102(4):1161–73 (harmonized ranges, n>9,000). Endocrine Society CPG: Testosterone Therapy in Men with Hypogonadism.
🩸 Test your Total Testosterone
Order directly through Marek Diagnostics — no doctor's visit needed, drawn at any Quest location in the US. Code CAMERON applies 10% off automatically.
Order this test — 10% off → Browse all 102 markers →What Total Testosterone is usually tested alongside
On its own, one marker is a data point. These panels include Total Testosterone plus the markers that make it interpretable — each names every test, why it is on the list, and loads the whole set into your cart in one click at 10% off.
includes this + 10 more markers · built for men — Fatigue, low libido, poor recovery, mood or body composition changes — and you're considering TRT. Read this before you start.
includes this + 10 more markers · built for men — You've decided to start testosterone therapy. Draw this before your first injection.
includes this + 9 more markers · built for women — Irregular or absent periods, acne, unwanted hair growth, scalp thinning, difficulty losing weight, or you've been told 'probably PCOS' without a workup.
includes this + 10 more markers · built for women — Anywhere from late 30s onward with cycle changes, night sweats, sleep disruption, mood shifts, joint aches, brain fog, or a libido that fell off a cliff.
What moves your Total Testosterone
13 compounds and 1 supplement in the Vault have a documented effect on this marker, or are a reason to have measured it first:
Browse all 237 compounds & 350 supplements →
Would you feel it? Symptoms Total Testosterone helps explain
People rarely search for a marker — they search for how they feel. These are the complaints where this marker is worth checking, and whether it is a first-line test or a follow-up once the obvious causes are ruled out.
Why your Total Testosterone might be wrong
Most abnormal results are interference, not disease. These are the things that measurably move this specific marker — check them before you change anything. Each one says whether the number is wrong and should be repeated, badly timed and should be redrawn, or real with a cause worth explaining.
Testosterone peaks in the early morning and falls through the day, with the difference largest in younger men — a 4pm draw can read 20–30% below the same man at 8am.
Draw before 10am, and always at the same time when tracking.
A single low reading reclassifies on repeat in a meaningful share of men. Illness, poor sleep and hard training all suppress it acutely.
Two low morning draws on separate days before anyone calls it low. Guidelines require this and telehealth frequently skips it.
Direct immunoassays are unreliable at the low end and in women. LC-MS/MS is the reference method.
Ask for LC/MS where the number will drive a decision.
Rises after eating, so a non-fasted draw measures your breakfast rather than your baseline.
Draw fasted, 10–12 hours, water only.
What Total Testosterone means in combination
A single marker tells you a little. Combinations tell you the story — these are the named patterns this marker takes part in, and what each one points at.
High SHBG is binding up your testosterone so little is bioavailable. The total number looks fine and everyone tells you you're normal.
Investigate why SHBG is high: aggressive dieting, very-low-fat intake, hyperthyroidism, liver disease, aging, anticonvulsants. Often the fix is eating more and adding dietary fat rather than adding testosterone.
The signal from the pituitary is weak — the testes are likely fine. Common reversible causes: obesity, sleep apnea, opioids, high prolactin, severe energy deficit, over-training.
Find and fix the cause before committing to lifelong TRT. Check prolactin, get a sleep study if you snore, address body composition and energy availability. Enclomiphene or hCG may restore your own production.
Prolactin suppresses the gonadal axis and blunts libido independently of testosterone. It gets blamed on estradiol constantly, and the AI that follows makes things worse.
Repeat the draw before acting — prolactin rises with stress, sleep, food and the needle itself. Persistent elevation with headaches or vision changes needs pituitary imaging. Rule prolactin out before you touch an AI.
Suppressed HPTA that has not restarted. The longer it sits shut down, the harder recovery gets — and "waiting it out" past a few months is usually not a plan.
Retest 4–6 weeks apart before concluding anything; recovery is slow, not absent. If it has not moved by ~12 weeks, get properly evaluated rather than self-treating. The Post-Cycle / HPTA Recovery protocol covers the sequencing.
What to test next
Markers rarely answer alone. These are the ones that put Total Testosterone in context — each with its own full breakdown.
Frequently asked questions
264–916 ng/dL (harmonized range, healthy non-obese men 19–39) Ranges vary by laboratory and assay — always compare to the range printed on your own report.
Most optimization-focused clinicians target the upper-middle: ~500–900 ng/dL, weighting symptoms and free T above the total number. Harmonized 50th percentile is 531 ng/dL.
In men: exogenous testosterone/AAS, or high SHBG masking low free T. In women: PCOS, adrenal tumor, or over-supplementation — presents as acne, scalp hair loss, hirsutism, cycle irregularity.
Fatigue, low libido, poor recovery, loss of muscle and bone, depressed mood, insulin resistance, poor erections in men.
You can order Total Testosterone directly through Marek Diagnostics without a doctor's visit — drawn at any Quest Diagnostics location in the US. Code CAMERON applies 10% off automatically.