Understanding the marker
Testosterone has roles in reproductive function, muscles and bones. The test measures total testosterone in the blood and is assessed with symptoms and related hormones.
Testosterone varies with sampling time, sleep, illness and hormone treatment. Follow the collection instructions for the ordered test. An unexpected result may need confirmation; SHBG and other hormone results help determine its meaning.
What does high Testosterone mean?
A high total testosterone result is assessed with SHBG, related hormones and any medicines or hormone treatment. The result alone does not establish a cause or a reproductive diagnosis.
What does low Testosterone mean?
A low total testosterone result is interpreted using the appropriate reference interval, symptoms, sampling time and SHBG. It does not establish hormone deficiency on its own or show whether treatment is needed.
Panels that measure Testosterone
Testosterone Basics
Testosterone Advanced
Men's Health
Women's Hormone Health
Founders Panel Plus
Reading
- The menstrual cycle phase by phase: what your hormones do
- PMOS (previously called PCOS) and blood tests: the values that bring clarity
- Measuring testosterone properly: total, free and SHBG
- Men’s health after 40: choosing blood tests for your risk and symptoms
- Normal testosterone levels by age
- Free testosterone, total testosterone and SHBG: the difference
- Morning or evening blood test: does it matter?
- Which blood tests are relevant for hair loss?
More markers in the same area
This is general information about the marker, not an assessment of your values and not medical advice. Last updated: October 2026.