what does testosterone free mean
Testosterone is usually bound, or connected, to a protein called sex hormone binding globulin. Testosterone that is not bound to this hormone is known as free testosterone. Testing the levels of free testosterone in the blood may be done if the patient is experiencing certain issues. slide 2 of 5. blood test to check the free testosterone levels may be ordered in several cases. Some of these cases are: 1  A man or woman is complaining of a decreased sex drive. 2  A man is suffering from erectile dysfunction.