How do you test for testosterone deficiency?

Blood testing is the only way to know for sure if you have a testosterone deficiency. Our Initial Testosterone Blood Test (a simple finger-prick test) can be taken at home. If the results show that you have low testosterone and you'd like to start testosterone replacement therapy, UK regulations require you to take a second, more comprehensive blood test first to ensure that you can safely start treatment. This one is a venous test which has to be administered by a nurse or phlebotomist.