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Nephrol Dial Transplant (1993) 8: 716-719
© 1993 European Renal Association-European Dialysis and Transplant Association

research-article

Determination of total body water in uraemic patients by bioelectrical impedance

C. H. Kong1,, C. M. Thompson1, C. A. Lewis2, P. D. Hill1 and F. D. Thompson1

1St Peter's Hospital, The Middlesex Hospital London, UK 2King's College Hospital London, UK

Correspondence and offprint requests to: Correspondence and offprint requests to: Dr C.H. Kong, St Peter's Hospital, The Middlesex Hospital, Mortimer Street, London WIN 8AA, UK.

The measurement of total body water by bioeiectrical impedance in a group of renal patients was evaluated against the tritium dilution method. The effect of haemodialysis and the presence of peritoneal dialysate on the impedance were also investigated. The correlation between the two methods is r = 0.90 with a residual standard deviation of 3.7. The standard devi ation of the differences between the two methods against the means was 3.66 which means that total body water (TBW) estimated by the bioelectrical impedance (BEI) method may be 6.181 (X ± 2 SD) above or 8.381 below the 3H2O method. The BEI method overestimated the actual weight loss after haemodialysis (3.87±1.71 versus 2.43±1.81) but underestimated the volume of peritoneal dialysate in situ The BEI method would not be appropriate for use in assessing total body water and monitoring acute volume changes in patients with renal failure who are on strict fluid restriction.

Keywords: bioelectrical impedance; body composition, dialysis; total body water


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S. W. Lee, J. H. Song, G. A Kim, K. J. Lee, and M.-J. Kim
Assessment of total body water from anthropometry-based equations using bioelectrical impedance as reference in Korean adult control and haemodialysis subjects
Nephrol. Dial. Transplant., January 1, 2001; 16(1): 91 - 97.
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