Testosterone Test
Also known as: Total Testosterone, Serum Testosterone
What is Testosterone?
Testosterone is the primary male sex hormone, important for muscle mass, bone density, libido, and mood. Women also produce smaller amounts.[MedlinePlus (NIH)]
What This Test Measures
This test measures the total testosterone level in your blood. Free testosterone (unbound) can also be measured.[Mayo Clinic]
Why It's Important
Testosterone levels help diagnose hypogonadism, infertility, and hormonal disorders.[MedlinePlus (NIH)]
Low testosterone causes fatigue, decreased libido, muscle loss, and mood changes.[Cleveland Clinic]
Normal Range
Men: 270-1,070 ng/dL. Women: 15-70 ng/dL.
Note: Levels vary by age, time of day (highest in morning), and laboratory.
Source: Cleveland ClinicHigh Values
High testosterone in men may indicate tumors or steroid use. In women, it can indicate PCOS, adrenal disorders, or tumors.[Mayo Clinic]
Low Values
Low testosterone causes fatigue, low libido, erectile dysfunction, depression, and loss of muscle mass. Causes include aging, obesity, diabetes, and pituitary problems.[Cleveland Clinic]
Test Preparation
Blood should be drawn in the morning when testosterone levels are highest.[MedlinePlus (NIH)]
References
Medical Disclaimer
This information is for educational purposes only and is not intended as medical advice. Always consult with a qualified healthcare provider for interpretation of test results and medical decisions.
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