How is testosterone deficiency
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.
- Blood will usually be taken in the morning (between 7.00am and 11.00am) when testosterone in your blood is naturally at its highest level
- Most of the testosterone in your blood is bound tightly by a protein called sex hormone-binding globulin (SHBG) and so it is not free to do its job. Because of this your blood may also be tested for levels of SHBG in order to work out how much of the total testosterone is free testosterone (also known as bioavailable or bioactive testosterone)
- The results of these tests will need to be confirmed by taking a second sample
- If tests confirm that you have low testosterone, additional tests may be required and you may be referred to a specialist. Your doctor will advise you of what additional tests are needed