Testing for Low Testosterone

It is important to not make a diagnosis of low testosterone levels based on symptoms alone. A healthcare provider will order certain types of blood tests to measure your levels of testosterone. However, because levels can vary quite a bit from day to day, your healthcare provider may recommend a second test to verify your results.
One of the most common methods of low testosterone testing is called a "serum total testosterone" test. Most laboratories can perform this particular blood test. There is also a "serum-free testosterone" test, but only a few laboratories in the country are able to perform this test accurately. In general, a person is considered to have low testosterone levels if the serum total testosterone is below 300 ng/mL.
After confirming a diagnosis of low testosterone levels, your healthcare provider may recommend other tests to help determine the specific cause of this deficiency.
(To learn more about testing for this condition, click Diagnosing Low Testosterone. This Web selection provides a detailed look at how a healthcare provider will identify this condition and also describes which methods are unreliable.)
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