Alireza Rajaei - Shahid Beheshti University of Medical sciences, Faculty of medicine, Tehran, Iran

Bone mineral densitometry (BMD) is the most valuable method for assessing bone and calculating fracture risk. Serial or comparative bone densitometry is important in rheumatologists' work on osteoporosis management. The response or lack of response to osteoporosis treatment based on densitometry scans is crucial. This paper examines the timing of scan requests concerning the history of glucocorticoid use, renal or other solid organ transplantation, malignancy, and other situations discussed. We encountered four types of compared scans based on the centers where BMD was performed and the precision of the devices used for this survey: Same Center, Same Device (SSSD), Same Center Different Devices (SCDD), Different Centers Same Devices (DCSD), and Different Centers Different Devices (DCDD). We discussed the principles of comparison and the key indicators.

Bone densitometry, Bone Density, Serial BMD, Compared BMD, Center, device