Fiona is absolutely right!  My daughter had the same bone density test done about a year ago because of numerous breaks and the fact that she has taken steroid medication almost all her life and Lupron for almost 8 years.  It was a very easy test - no dies,  just lie back, keep still, and let the machine do the scan.  The doctor told us the results literally minutes after the test, showing us on his computer in his office.  Good luck.