How is testosterone deficiency diagnosed?
Doctors base a diagnosis of low testosterone on the presence of symptoms and the results of blood tests that measure testosterone levels.
Your doctor will ask you some questions to help understand what signs or symptoms you may be experiencing that suggest you have low testosterone. The symptom most associated with low testosterone is reduced sex drive (low libido), however your doctor will ask about a range of symptoms.
Because many of these symptoms are not necessarily only due to low testosterone, your doctor will perform a physical exam and may take a blood sample to measure testosterone levels.