Despite strong correlations, BIA showed poor concordance with DXA for every parameter assessed in paediatric CKD, with clinically unacceptable limits of agreement, confirming that correlation does not imply interchangeability and DXA remains necessary for individual-level assessment.
BIA showed strong to very strong correlations with DXA for key body composition parameters in children with CKD stages 3-5.
Lin's concordance correlation coefficient (CCC) indicated poor concordance between BIA and DXA for all body composition parameters assessed.
BIA systematically underestimated fat mass and overestimated fat-free mass relative to DXA.
DXA detected significant stage-wise reductions in multiple body composition parameters across CKD stages, whereas BIA detected only decline in fat-free mass index (FFMI).
The study was a cross-sectional design assessing agreement between BIA and DXA in 102 children with CKD stages 3-5.
The authors concluded that BIA may retain a role in population-level nutritional screening in resource-limited settings but that DXA remains necessary for individual-level assessment in paediatric CKD.
This research suggests that while a portable body composition measurement tool called bioelectrical impedance analysis (BIA) produces readings that move in the same direction as the gold-standard method called dual-energy X-ray absorptiometry (DXA) in children with chronic kidney disease (CKD), the two methods cannot be used interchangeably. The study enrolled 102 children aged 5–14 years with moderate to severe CKD and found that although BIA and DXA results were strongly correlated, BIA consistently underestimated body fat and overestimated lean tissue compared to DXA, with differences large enough to matter clinically for individual patients. A particularly important finding was that DXA could detect meaningful worsening of body composition as kidney disease progressed through stages 3 to 5, identifying reductions in fat mass, lean mass, and related measures. BIA, by contrast, could only detect one of these four changes. This means that using BIA alone in a child with CKD could miss important deterioration in their nutritional status that a clinician would need to know about to guide treatment. This research suggests that BIA might still be useful for broad nutritional screening at the population level, especially in settings where DXA is too expensive or unavailable, but it should not replace DXA when precise, individual-level body composition assessment is needed in children with kidney disease. The study also notes that whether BIA can reliably track changes over time in this population was not tested and remains an open question.
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Upload Your LabsKarri M, Dawman L, Sadasivam D, Vallabhaneni P, Mahajan S, Singh T, et al.. (2026). Bioelectrical impedance analysis versus dual-energy X-ray absorptiometry for body composition assessment in children with chronic kidney disease.. European journal of pediatrics. https://doi.org/10.1007/s00431-026-07355-x