BODY-COMPOSITION ANALYSIS BY DUAL-ENERGY X-RAY ABSORPTIOMETRY IN FEMALE DIABETICS DIFFER BETWEEN MANUFACTURERS

Objective: Comparison of body composition results by two dual energy X -ray absorptiometry (DXA) instruments, namely QDR-2000 from Hologic In c and DPX from Lunar in subpopulations of lean and obese subjects. Des ign: Cross-sectional study with 85 female diabetics (BMI 18-43 kg/m(2) ) measured with both DXA instruments. Results: The regression lines fo r fat tissue mass (FTM), FAT% and total body bone mineral content (TBM C), but not lean tissue mass (LTM), were different from the line of id entity (P < 0.01). However, the relationships were high (r(2) > 0.95), and the corresponding SEE%'s were low (0.8-4.8%), and were independen t of BMI. FTM and FAT% measured by the QDR-2000 were 10% higher, and L TM and TBMC 6% lower, than by DPX (P < 0.001). Conclusions: There were lack of agreements between total body composition results by DPX Luna r, and QDR-2000 Hologic Inc. Individual results on the two systems can not be directly compared. Standardization of body composition measurem ents by DXA is strongly needed.