What is this test?
Testosterone is a sex hormone that affects reproductive function, muscles, bones, hair and sexual health in both sexes.
Why might it be ordered?
- With symptoms of androgen deficiency or excess, disorders in puberty or sexual function.
- For menstrual disorders, unusual hair growth or fertility assessment.
What sample is needed?
A healthcare professional collects a venous blood sample. Depending on the method, the laboratory uses serum or plasma.
How should you prepare?
Collection time is particularly important in men, and a morning sample is often preferred. Report hormone treatment and anabolic steroids. Tell the laboratory about all medicines, hormone treatments, vitamins and supplements you take. Do not stop or change treatment unless your clinician tells you to. Follow any instructions about fasting and the time of collection.
How should you understand the result?
Total testosterone is affected by SHBG. If symptoms are inconsistent, SHBG and free or estimated testosterone may be needed. Your result is interpreted using the reference interval on the laboratory report and in the context of your symptoms, medical history and other test findings.
Sources and editorial status
This patient-facing text is an editorial draft. It should be approved by a laboratory physician before official publication.