BMD Measurement and Precision: A Comparison of GE Lunar Prodigy and iDXA Densitometers

BMD at the L1-L4 spine, total proximal femur, and femoral neck was very highly correlated (r2 ≥ 0.98) between densitometers, as was the one-third radius site (r2 = 0.96). Bland-Altman analyses demonstrated no clinically significant bias at all evaluated sites. BMD precision was similar between instruments at the L1-L4 spine, mean total proximal femur, and femoral neck. Finally, one-third radius BMD measurements in the supine vs seated position on the iDXA were highly correlated (r2 = 0.96). In conclusion, there is excellent BMD correlation between iDXA and Prodigy densitometers. Similarly, BMD precision is comparable with these two instruments.