If you suspect you may have symptoms associated with low testosterone levels, such as fatigue, decreased sex drive, or increased fat mass, talk to your healthcare provider. A simple blood test is all it takes to diagnose this problem.
The most commonly used blood test is the "serum total testosterone" test. In general, anything below 300 ng/mL is considered low. However, because testosterone levels can vary from day to day, and from hour to hour during the day, your healthcare provider may recommend having more blood tests to confirm this diagnosis.
It is important that a diagnosis of low testosterone levels is not made solely based on symptoms. Also, do not try to self-diagnose this condition and treat yourself. This could lead to potentially dangerous complications.
(Click Diagnosing Low Testosterone for more information on how a healthcare provider may diagnose low testosterone levels. This article also describes some of the inaccurate and unreliable ways of determining whether you have this condition.)
Written by/reviewed by: Arthur Schoenstadt, MD
Last reviewed by: ArthurSchoenstadt, MD
List of references (click here):
Purifoy FE, Koopmans LH, Mayes DM. Age differences in serum androgen levels in normal adult males. Hum Biol 1981; 53:499.
Vermeulen A, Verdonck L, Kaufman JM. A critical evaluation of simple methods for the estimation of free testosterone in serum. J Clin Endocrinol Metab 1999; 84:3666.
Rosner W, Auchus RJ, Azziz R, et al. Position statement: Utility, limitations, and pitfalls in measuring testosterone: an Endocrine Society position statement. J Clin Endocrinol Metab 2007; 92:405.
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