How is low testosterone diagnosed?

Low testosterone is diagnosed by measuring the amount of testosterone in the blood with a blood test. It may take several measurements to determine if a patient has low testosterone, since levels tend to change throughout the day. The highest levels of testosterone are generally in the morning, near 8 a.m. This is why doctors prefer to measure testosterone levels in the early morning.

Last reviewed by a Cleveland Clinic medical professional on 04/10/2018.

References

  • The Endocrine Society. Testosterone Therapy in Men Accessed 4/13/2018.
  • American Urological Association. What is Low Testosterone? Accessed 4/13/2018.
  • Bhasin S et al. J Clin Endocrinol Metab, May 2018, 103(5):1–30.
  • Pantalone KM, Faiman C. Male hypogonadism: More than just a low testosterone. Cleveland Clinic Journal of Medicine, Volume 79, Number 10, 717-725.

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