What is a normal testosterone level?
FAQThe most widely used harmonized reference range for total testosterone in healthy nonobese men aged 19–39 is 264–916 ng/dL (2.5th–97.5th percentile), with a median of 531 ng/dL, per Travison et al. (2017). The 2018 Endocrine Society guideline uses 264 ng/dL as the lower diagnostic threshold. Ranges vary by lab and assay.
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The harmonized reference range
A 2017 study — Travison, Vesper, Orwoll, et al., The Journal of Clinical Endocrinology & Metabolism, 102(4):1161–1173 — pooled four cohorts of healthy nonobese men aged 19–39 and, after standardizing to a CDC reference method, reported these total-testosterone percentiles: 2.5th 264, 5th 303, 50th (median) 531, 95th 852, 97.5th 916 ng/dL. The 264–916 ng/dL span between the 2.5th and 97.5th percentiles is the commonly cited “normal” range.
The diagnostic threshold guidelines use
The 2018 Endocrine Society Clinical Practice Guideline (Bhasin et al., JCEM 103(5):1715–1744) adopts 264 ng/dL — the lower limit of that harmonized range — as the threshold below which, with consistent symptoms and a repeat morning measurement, hypogonadism is considered. These figures are reported as the sources state them, not as a personal target.
Why ranges vary by lab and assay
The Travison paper is explicit that lab results are not directly comparable: “A substantial proportion of intercohort variation in testosterone levels is due to assay differences.” Before harmonization, three cohorts of men aged 40–49 measured 501, 551, and 618 ng/dL; after standardizing to the CDC method they converged to 487, 494, and 471. A given lab's reference interval depends on its assay and population — which is why the harmonized range exists, and why an individual result is read against the reporting lab's own range.
- Harmonized normal range (Travison 2017, healthy nonobese men 19–39): 264–916 ng/dL, median 531.
- Endocrine Society 2018 lower diagnostic threshold: 264 ng/dL.
- Results vary by lab and assay — read against the reporting lab's own reference interval.
To log testosterone results and track them over time against a protocol, see the Prof. Peptide app.
TRT Nation
TRT Nation is a telehealth clinic offering testosterone therapy, enclomiphene, weight-loss treatment, anti-aging and sexual health protocols, plus its own lab panel. It holds a LegitScript certification and operates from a physical clinic in Tampa with a published phone line and weekday support hours. Its homepage displays 4.9 stars across more than 2,000 Google reviews, as displayed on TRT Nation’s homepage (checked 28 September 2026).
TRT Nation is one of the few clinics that accepts outside lab work rather than requiring a new panel. TRT Nation states two different windows for outside bloodwork. Its homepage says: “We require the following labs that can be up to 6 months old:” — listing Total Testosterone, Complete blood count, Comprehensive metabolic panel, Estradiol and PSA, with PSA carrying its own qualifier, “PSA (This test is also required for men over 40)”. Its FAQ page says: “If you’ve had recent labs drawn (typically within 120 days) that include the relevant markers, your TRT Nation provider may be able to use them to expedite your intake.” The two windows differ — 120 days is roughly four months against the homepage’s six — and Prof. Peptide reports both. A panel can also be ordered through TRT Nation.
TRT Nation’s process runs treatment selection, then bloodwork submission or ordering, then a one-on-one consultation in which a licensed provider reviews the labs and sets the protocol. Medication is prescribed after that consultation, dispensed through regulated US pharmacies, and shipped with free shipping and ongoing monitoring. It treats patients 24 and older. TRT Nation states its coverage two different ways. Its homepage says: “We operate in every state with the exception of Alabama, Alaska Arkansas, Missouri, and Hawaii.” — naming 5 exclusions, which leaves 45 of the 50 states. That 45 is arithmetic done by Prof. Peptide, not a figure TRT Nation publishes anywhere. Its FAQ page instead says: “TRT Nation currently serves patients in the majority of U.S. states.”, and adds that eligibility by state is confirmed during the online intake. The two statements differ, and Prof. Peptide reports both rather than choosing between them.
Visit TRT NationWe may earn a referral fee from healthcare provider links on this page.
Prof. Peptide’s own write-up of this provider — published prices, how the intake and lab work run, and what could not be verified — is at TRT Nation.
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This page is educational and is not medical advice. Testosterone replacement therapy is a prescription treatment; decisions about individual care belong with a licensed healthcare provider.