Total Testosterone (TT)
Also known as: TT
Total testosterone measures all circulating testosterone — bound and unbound. It is the entry-point androgen biomarker but is always interpreted alongside free testosterone and SHBG.
What Total Testosterone measures
Total testosterone measures the sum of all circulating testosterone — protein-bound (to SHBG and albumin) plus the small unbound fraction. It is the entry-point androgen biomarker and the most commonly ordered hormone test in men.
Clinical significance
Total testosterone underwrites energy, libido, body composition, recovery, mood, cognition, and metabolic health. A single value rarely tells the full story: SHBG variation can shift total testosterone significantly without changing the biologically active free fraction. Provider-reviewed interpretation always pairs total testosterone with free testosterone, SHBG, estradiol, hematocrit, lipids, CBC, and CMP.
How oMeds reviews it
Inside the oMeds Hormone Optimization pathway, total testosterone is the baseline marker but never the deciding marker. Symptoms, SHBG context, free testosterone, and estradiol all carry equal weight. We require morning draws to control for diurnal variation, and a second confirmatory draw before initiating therapy.
Standard clinical reference intervals
Lab-reported reference ranges from established standards bodies. These are diagnostic thresholds — they do not represent optimization targets.
Source: Endocrine Society 2018 Clinical Practice Guideline — Testosterone Therapy in Men with Hypogonadism
Morning draw, fasting preferred. Local lab ranges vary.
Source: Mayo Clinic Laboratories adult female reference interval
oMeds optimization targets
Editorial bands that inform provider-reviewed conversations. These are wellness targets, not diagnostic thresholds.
Symptom resolution in provider-reviewed optimization most consistently correlates with total testosterone in the upper-mid reference range when free testosterone and estradiol are concurrently balanced.
oMeds optimization ranges are editorial targets that inform conversations with a licensed provider. They are NOT diagnostic thresholds and do not replace lab reference ranges.
Total Testosterone — frequently asked
Why is my total testosterone normal but I still feel low-T?
Symptom-biomarker mismatch most often traces to elevated SHBG, which binds testosterone and lowers the bioactive free fraction. Provider review pairs total testosterone with free testosterone, SHBG, and estradiol before any conclusion.
Does total testosterone vary throughout the day?
Yes. Total testosterone peaks in the early morning and declines through the day. oMeds requires morning draws (before 10 AM) for both baseline and recalibration panels.
Source literature
- Endocrine Society 2018 Clinical Practice Guideline · Journal of Clinical Endocrinology & Metabolism
- AUA Evaluation and Management of Testosterone Deficiency (2018) · American Urological Association
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