HRT = Hormone Replacement Therapy. As we age, our body produces less test. The only way to know is to get lab work done at your Dr. If you don't have a general physician, you can find places online like http://www.privatemdlabs.com/, where you can buy the labs you need and have your blood work done at a local lab like Quest Diagnostics. What you want is a male hormone panel testing your total and free testosterone.