Testosterone
Also known as: Total testosterone, T
Testosterone is a hormone present in everyone, in differing amounts. It plays roles in muscle, bone, mood, and reproductive health. The common blood test usually measures total testosterone.
Why it's measured
Testosterone may be checked when looking at hormonal balance, energy, or reproductive health. Levels naturally vary through the day, so timing of the blood draw matters.
Typical range
Reference ranges vary widely by lab, sex, age, and the time of day the sample was taken. Because of this, your result is best interpreted against your own report’s range and your doctor’s knowledge of your situation.
What high values can mean
A higher testosterone result is one value doctors interpret in the context of your symptoms, timing of the test, and other hormones.
What low values can mean
A lower testosterone result is similarly read in context, often with attention to the time of day the sample was drawn and possible repeat testing.
Questions to ask your doctor
- Was my blood drawn at a time of day that makes this result meaningful?
- Should this be repeated or paired with other hormone tests?
- How does this fit with how I’ve been feeling?
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Try the explainerEducational information only — not medical advice, diagnosis, or treatment. Reference ranges vary by lab; always use your own lab's range and discuss results with a qualified clinician.