Can a bone density test yield different results on different bones?

@jozer I wondered this same thing, but someone on Mayo Clinic Connect sent me an article by a well-known expert in osteoporosis demonstrating that getting to a score of -1.5 is just as good at lowering the risk of a fracture as a score of -1.0, the standard score of a 30-year-old woman.

@dvargo I was told that here in the US Dexa is used to determine treatment. There seem to be a lot of people who get very different scores with Dexa and Rems. I'm going to get a Rems scan in February. I'm curious to see what it shows!

@sebutler I think that the definition of 0 T score is the average of a 30yo woman, although -1.0 or better is considered within normal range.
https://www.uab.edu/shp/toneyourbones/step-2-bone-density-testing/the-results-of-your-scan/t-scores

@soggybones If dexa determines treatment, what does Rems determine? Again, my dexa was good and Rems not good. Which one to believe? I am doing my 2nd Rems next month, 20 min from my house. Feel so blessed to have this in our state.

@dvargo I think most doctors will treat based on Dexa. Did you get a TBS score when they did your Dexa? That should tell you bone quality. That can be important in determining if you need treatment or not. If not then I would seek that out. Your REMS scan can evaluate bone quality so if your bone quality is compromised you can get a poor score. If Dexa only measured your bone density without TBS it's possible it gave you a misleading "good" result. You can have good bone density and poor bone quality.