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Related Experiment Video

Updated: Mar 1, 2026

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis
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Reliability of multiple frequency bioelectrical impedance analysis: An intermachine comparison.

L C Ward1, N M Byrne2, K Rutter1

  • 1Department of Biochemistry, University of Queensland, Brisbane QLD 4072, Queensland, Australia.

American Journal of Human Biology : the Official Journal of the Human Biology Council
|June 1, 2017
PubMed
Summary

This study assessed the reliability of bioimpedance monitors, finding them accurate for measuring impedance and phase. While extrapolated values showed some decrease in accuracy at lower impedances, overall reliability for whole-body measurements was high.

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Area of Science:

  • Biomedical Engineering
  • Human Physiology
  • Medical Instrumentation

Background:

  • Bioimpedance analysis is a method for assessing body composition and fluid status.
  • Ensuring the technical reliability of bioimpedance monitors is crucial for accurate clinical and research applications.
  • Previous assessments of bioimpedance monitor reliability have varied in methodology and scope.

Purpose of the Study:

  • To evaluate the technical reliability, including interinstrument and interoperator reliability, of three SEAC-swept frequency bioimpedance monitors.
  • To assess measurement errors and associated analyses for bioimpedance monitors.
  • To determine intraoperator and intrainstrument variability for repeat measurements.

Main Methods:

  • Assessed measurement accuracy using resistance-capacitance circuits across a range of impedance and phase values.
  • Evaluated interinstrument and interoperator reliability using whole-body measurements on human volunteers.
  • Determined intraoperator and intrainstrument variability through repeat measures over a 4-hour period.
  • Analyzed extrapolated impedance values at zero and infinite frequencies.

Main Results:

  • Measured impedance values were accurate to within 3% of theoretical values (50-800 ohms).
  • Phase measurements showed a maximum deviation of 1.3° from theoretical values (1°-19°).
  • Extrapolated impedance at zero frequency was determined within ±3%.
  • Accuracy of extrapolated impedance at infinite frequency decreased below 50 ohms.
  • Interinstrument/operator variation for whole-body measurements showed biases < ±1% for impedance and < 3% for phase.
  • Variation in extrapolated values, including operator analysis choices, was < ±0.5%.

Conclusions:

  • SEAC-swept frequency bioimpedance monitors demonstrate high technical reliability for impedance and phase measurements within their specified ranges.
  • The monitors exhibit low interinstrument, interoperator, intraoperator, and intrainstrument variability for whole-body assessments.
  • While extrapolated impedance at infinite frequency has limitations at lower impedance values, the overall reliability supports their use in human bioimpedance studies.