The #1 Test for Determining Bone Loss (Not DEXA).. A bone density scan tells you if you have osteopenia or osteoporosis. What it won't tell you is if you're still actively losing bone right now. If you’ve been told you have osteoporosis and bone loss, you need to watch this! This is the #1 test for understanding whether you're a still actively losing bone and if you're at risk of progressing to osteoporosis. Many people don't even know they have bone loss, but with the help of serum CTX, early d