Is My Testosterone Normal? Free T Level Checker by Age
Table of Contents
Medical Disclaimer: This tool is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Testosterone levels should be interpreted by a qualified healthcare provider alongside symptoms, medical history, and additional lab work. Always consult a doctor before making health decisions.
Is My Testosterone Normal?
Enter your age and total testosterone level to see where you stand — compared to clinical reference ranges and age-adjusted data from peer-reviewed research.
Testosterone Levels by Age: Reference Table#
Age-adjusted testosterone reference data compiled from Travison et al. 2017 (nonobese cohort), Schlegel et al. 2022, and the Endocrine Society Clinical Practice Guidelines.
| Age | Median (ng/dL) | Age-Adjusted Low* | Endocrine Society Low |
|---|---|---|---|
| 18–24 | 531 | < 409 | < 264 |
| 25–29 | 531 | < 413 | < 264 |
| 30–34 | 531 | < 359 | < 264 |
| 35–39 | 531 | < 352 | < 264 |
| 40–44 | 481 | < 350 | < 264 |
| 45–49 | 481 | < 300 | < 264 |
| 50–59 | 477 | < 300 | < 264 |
| 60–69 | 477 | < 300 | < 264 |
| 70+ | 477 | < 300 | < 264 |
*Age-adjusted thresholds from Schlegel et al. 2022 for ages 18-44; AUA standard (<300 ng/dL) for 45+. Medians from Travison et al. 2017, nonobese cohort.
Testing Tips#
Test in the Morning
Testosterone peaks between 7–10 AM. Testing later in the day can give a reading 20–30% lower than your true peak. Most guidelines require a morning draw.
Fast Overnight
Eating before your blood draw can temporarily lower testosterone levels. Fast for 8–12 hours beforehand. Water is fine.
Repeat to Confirm
The AUA recommends confirming a low result with a second morning test. Testosterone fluctuates day to day — one reading isn't enough for a diagnosis.
Avoid Testing When Sick
Illness, severe stress, poor sleep, and acute injuries can all temporarily suppress testosterone. Wait until you're healthy for an accurate baseline.
Understanding the Zones#
Most lab reports tell you your testosterone is “normal” if it falls anywhere between 300 and 1,000 ng/dL. But that range is enormous — and it doesn’t account for your age.
Why 300–1,000 Is Too Broad#
A 25-year-old at 320 ng/dL is technically “in range” but likely symptomatic. His age-adjusted data (Schlegel et al. 2022) suggests he should be above 413 ng/dL. Meanwhile, a 65-year-old at 320 ng/dL is much closer to expected levels for his decade.
This is why age-adjusted reference ranges matter. A single cutoff doesn’t tell the full story.
What Is Hypogonadism?#
Hypogonadism is the clinical term for low testosterone. The Endocrine Society defines it as total testosterone below 264 ng/dL, while the AUA uses a threshold of 300 ng/dL. Both require two separate morning blood draws plus the presence of symptoms for a formal diagnosis.
Symptoms alone don’t confirm hypogonadism. Blood work alone doesn’t confirm it either. It’s the combination of low levels plus symptoms that matters.
Total Testosterone vs. Free Testosterone#
This tool checks total testosterone — the most commonly ordered test. But total T includes both:
- Bound testosterone (~98%) — attached to SHBG or albumin, not immediately available
- Free testosterone (~2%) — the biologically active form your body can actually use
Some men have normal total T but low free T (often due to high SHBG, which increases with age). If your total T is borderline but you have symptoms, ask your doctor to check free T and SHBG.
What Else Should You Test?#
A comprehensive hormone panel includes:
- Total & Free Testosterone — the baseline
- SHBG — determines how much T is bioavailable
- Estradiol (E2) — testosterone converts to estrogen via aromatase
- LH & FSH — distinguish between primary and secondary hypogonadism
- CBC — baseline for monitoring hematocrit on TRT
- Metabolic panel — overall health markers
- Thyroid (TSH) — thyroid dysfunction mimics low T symptoms
Sources#
- Travison TG, et al. "Harmonized Reference Ranges for Circulating Testosterone Levels in Men of Four Cohort Studies in the United States and Europe." J Clin Endocrinol Metab, 2017;102(4):1161–1173.
- Schlegel PN, et al. "Evaluation and Management of Testosterone Deficiency: AUA Guideline (2018, amended 2022)." American Urological Association.
- Bhasin S, et al. "Testosterone Therapy in Men with Hypogonadism: An Endocrine Society Clinical Practice Guideline." J Clin Endocrinol Metab, 2018;103(5):1715–1744.
- Lincoff AM, et al. "Cardiovascular Safety of Testosterone-Replacement Therapy (TRAVERSE)." N Engl J Med, 2023;389:107–117.
- Salonia A, et al. "EAU/ICSM Guidelines on the Management of Sexual and Reproductive Health Conditions in Men." 2024.
Medical Disclaimer: This tool provides general educational information based on published clinical data. It is not a substitute for professional medical advice, diagnosis, or treatment. Testosterone levels should be interpreted in context with symptoms, medical history, and other lab values. Always consult a qualified healthcare provider. Affiliate disclosure
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