Verbatim response from Perplexity
There is no single testosterone number that automatically means treatment is needed. Most guidelines and expert sources say treatment is considered when low testosterone is confirmed on at least two morning blood tests and you also have symptoms such as low sex drive, fatigue, or erectile dysfunction.[2][3]
In practice, many clinicians use these rough cutoffs for total testosterone:
- Below 300 ng/dL: often considered low in U.S. practice, but treatment still depends on symptoms and repeat testing.[4][5]
- 200–300 ng/dL: a borderline/gray zone where symptoms matter a lot.[8]
- Below 8 nmol/L: considered low in some systems, with treatment usually recommended if confirmed twice.[7]
- 8–12 nmol/L: borderline, and treatment may be considered if symptoms are present.[7]
What matters most is that testosterone is interpreted in context. UCSF notes that two morning testosterone levels should be obtained before diagnosing low T, and treatment is appropriate for men with both low blood levels and symptoms.[2] Harvard Health similarly says low numbers alone do not always justify therapy.[3]
If you want, I can also give you the typical lab thresholds by age, or explain the difference between total, free, and bioavailable testosterone.