Hormones
Testosterone (Total) — what it measures
For understanding, not diagnosis. Reference ranges differ between laboratories; the ranges on your own report, and your doctor’s reading of them, always come first.
What it measures
This test measures the total amount of testosterone circulating in the blood, including the fraction bound to proteins. It is one of several hormones a clinician may consider when investigating energy, libido, fertility or puberty-related questions.
What can skew it
Levels are highest in the early morning and can be lowered temporarily by poor sleep, illness, alcohol and some medicines, so timing and repeat testing matter.
Reference ranges
Reference ranges vary by laboratory, age and sex, so a single number should only be interpreted against your own report's range and with your clinician.
Medical disclaimer: This page is educational only. It cannot tell you whether your result is normal or what to do about it — that is a decision for your doctor, with your full history.