Total testosterone
The total amount of testosterone measured in blood, including hormone bound to proteins and unbound hormone.
Educational tools, not diagnosis
Understand testosterone labs without falling into the supplement swamp.
Convert total testosterone units, learn what related markers can mean, compare age-context notes, and build a clean checklist for a clinician visit.
Calculator
Testosterone Unit Converter
Convert between common total testosterone lab units. Mayo Clinic Laboratories lists total testosterone conversion as ng/dL x 0.0347 = nmol/L.
ng/dL
500.00
nmol/L
17.35
ng/mL
5.00
Not medical advice: Reference ranges vary by lab, test method, age, sex, and clinical context. Use your lab's range and clinician interpretation first.
Lab context
Markers People Commonly See On Testosterone Panels
These are educational definitions. They are not medical advice, diagnosis, or instructions to self-treat.
Free testosterone
The unbound portion. Some guidelines discuss free testosterone when total levels are borderline or SHBG issues are suspected.
SHBG
Sex hormone-binding globulin binds testosterone and can affect how much is available to tissues.
LH and FSH
Signals from the pituitary. They can help clinicians distinguish primary testicular causes from pituitary or hypothalamic causes.
Estradiol and prolactin
Related hormones that may matter in selected cases, especially when symptoms, medication history, or fertility concerns are present.
Thyroid, vitamin D, metabolic labs
Fatigue, mood changes, weight gain, and low libido are not specific to testosterone. Other health issues can overlap.
Age guide
Testosterone Questions By Age Group
Age changes the conversation. This guide is educational only and cannot diagnose or rule out a medical condition.
Practical next step
Build a Cleaner Doctor Discussion
Most people arrive with one lab screenshot and panic. Better: record symptoms, sleep, training load, medication changes, timing of blood draw, and repeat-test history. This does not replace medical care.
Download lab tracker CSVQuestions to bring up
- Was my blood draw taken in the morning, and should it be repeated?
- Are symptoms consistent with testosterone deficiency or something else?
- Should LH, FSH, SHBG, prolactin, thyroid, metabolic, or sleep-apnea evaluation be discussed?
- If fertility matters, what options should be avoided or discussed before treatment?
- What monitoring would be needed if any therapy is considered?
Supplement evidence
Supplements: Lab Evidence vs Anecdote
Some nutrients matter when someone is deficient. Some herbs have limited human studies. Many claims are anecdotal, overstated, or unsafe. The supplement section categorizes each item by evidence quality and includes food/timing notes only when support exists.
Review supplement evidenceRules for this section
- Not medical advice or a recommendation to take anything.
- No supplement is labeled as a guaranteed testosterone booster.
- Evidence is separated from anecdote.
- Safety, interactions, and clinician discussion are shown before hype.
Science articles
Testosterone Effects, Risks, And When Treatment Is Evaluated
Evidence-based articles written for education, not self-treatment. Start here before believing any “more testosterone equals better everything” content.
Testosterone Unit Converter
A dedicated calculator page for converting total testosterone between ng/dL, nmol/L, and ng/mL.
Lab Tracker Template
A CSV download page for organizing lab timing, markers, symptoms, and clinician questions.
Science Of Testosterone Effects
What testosterone does in development, sexual function, muscle, bone, red blood cells, mood, and metabolism.
Negatives Of Dosing And Misuse
Fertility suppression, high red blood cells, sleep apnea, prostate monitoring, blood pressure, hidden steroid risks, and why dose matters.
When Testosterone Therapy Is Actually Evaluated
What guidelines say about symptoms, repeat morning tests, medical causes, possible benefits, and monitoring.
Lifestyle foundations
Useful Habits Without Fake Guarantees
These are general health habits often relevant to hormone conversations. This is not medical advice, and there is no promise that any one habit will raise testosterone for a specific person.
Sleep
Track sleep duration, quality, snoring, and daytime sleepiness. Sleep apnea is clinically relevant and needs proper evaluation.
Resistance training
Log training volume and recovery. Undertraining and overtraining can both create misleading narratives.
Body composition
Weight, waist, glucose, and lipids can be useful context for a clinician, especially in middle age.
Alcohol and medication review
Alcohol, opioids, steroids, some psychiatric medications, and other drugs can be part of the discussion.
Evidence standard