What testosterone level is considered low?
Last updated: January 2026
Quick Answer
Most medical guidelines define low testosterone as a total testosterone level below 300 ng/dL, measured via morning blood draw. However, many TRT specialists consider levels below 400-500 ng/dL as suboptimal, especially when accompanied by symptoms. Free testosterone should also be evaluated alongside total T.
What testosterone level is considered low
Most medical guidelines define low testosterone as a total testosterone level below 300 ng/dL, measured via morning blood draw. However, many TRT specialists consider levels below 400-500 ng/dL as suboptimal, especially when accompanied by symptoms. Free testosterone should also be evaluated alongside total T.
TRT eligibility is determined by your healthcare provider based on your symptoms and bloodwork. Most clinics require total testosterone below 300 ng/dL (some use 400 ng/dL as the threshold) along with clinical symptoms of low testosterone.
Standard Eligibility Criteria
- Total testosterone below 300-400 ng/dL on morning bloodwork
- Symptoms of low testosterone (fatigue, low libido, muscle loss, mood changes)
- No contraindications such as untreated prostate cancer or severe sleep apnea
- Age 18+ (most clinics prefer 25+)
The Evaluation Process
Your TRT provider will order comprehensive bloodwork including total testosterone, free testosterone, estradiol, SHBG, LH, FSH, PSA, CBC, and metabolic panel. This provides a complete picture of your hormonal health and helps determine the appropriate treatment protocol.
Related Questions
Who qualifies for TRT?
You may qualify for TRT if you have two morning testosterone levels below 300 ng/dL along with symptoms of low testosterone such as fatigue, low libido, erectile dysfunction, depression, or muscle loss. Your physician will evaluate your complete medical history and rule out other causes before prescribing.
What is the optimal testosterone level on TRT?
Most TRT physicians aim for trough testosterone levels of 600-1000 ng/dL (measured the morning of your injection, before your next dose). Free testosterone should be in the upper quartile of the reference range. Optimal levels vary by individual — the goal is symptom resolution with minimal side effects.