What it measures
Total testosterone is all the testosterone in the blood: the part bound to proteins and the small free part together. It is the standard first test for testosterone in both men and women.
Why people test it
- The first test when looking into low sex drive, erection problems, tiredness or low mood in men.
- Measured in women with excess hair growth, acne or irregular periods.
- Monitored in men and women who are prescribed testosterone.
- Monitored regularly on TRT, usually alongside haematocrit and PSA.
- The body's own testosterone can stay low for a time after an anabolic steroid cycle, which this test shows.
Typical range
Ranges vary between labs, with the method used, age and sex, and your report shows the lab's own range. One NHS trust lab gives 8.0 to 32.0 nmol/L for men aged 19 and over, and below 1.91 nmol/L for women. Source: Oxford University Hospitals NHS Foundation Trust: biochemistry reference ranges.
Finger-prick or vein?
A vein draw is usually advised. Testosterone gels or creams on the fingers can contaminate a finger-prick sample and give a falsely high result.
Testosterone is highest in the morning, so the sample is usually taken in the morning.