I have had two bone density scans and out of all the tests I've had done related to Crohn's, this one's a breeze by a long shot...LOL.
I had taken steroids by pill, injection, and IV for 6 years before it affected my bones...2 fractures in hips, one in left knee, very painful. My Endocrinologist put me on IV Zometa and it is all healing nicely. I am a 35 yealold female and feel very grateful they found out early before I need a hip replacement.
My advice is to just try to look on the positive side...your Dr.'s sound like they are taking all the right precautions and are on top of things. And the sooner you find out, the sooner you can take charge of your health and take steps to get better.
Keep up the good fight and never give up hope!