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The Bodystat Quadscan 4000 device offers a quick easy, economical and non-invasive alternative to other methods of fluid assessment and body composition
e.g. Radioisotope dilution, under water weighing.
The principle of measuring the flow of current through the body (impedance) is dependent on the frequency applied. At low frequencies the current cannot bridge the cellular membrane and will pass predominantly through the extra cellular space. At higher frequencies penetration of the cell membrane occurs and the current is conducted by both the extracellular water (ECW) and intra- cellular water (ICW) By measure the impedance at 5khz and 200khz and by applying predictive equations, it is possible to estimate both ECW andnTBW (total body water) respectively and by deduction, ICW. ECW can be related to extra-cellular mass and ICW to body cell mass. By measuring the impedance at 50khz and applying the unique Bodystat equation, body fat, lean mass and dry lean mass can be assessed. The Quadscan 4000 contains separate body composition equations for children 6 years and over and adults. In addition, the Quadscan 4000 measures at 100khz.
Total body weight, height, age and gender are required by the predictive equations used in the hardware unit to display the results on the LCD screen. Where it is impractical to determine weight, as in the case of certain hospitalized patients, alternative equations can be applied in the Quadscan 4000 program to calculate ICW, ECW and TBW.
Whole body analysis, rather that partial body analysis of arms or legs only, is measured for greater accuracy. In addition, alternative equations provide for proximal placement of electrodes on sternum and knee to potentially monitor more sensitively the changes in fluid levels in the trunk area. The strategic placement of the electrodes on the chest area could provide for the monitoring of change in impedance values (hence fluid shifts) in the left and right lung individually.
THE QUADSCAN 4000 MEASURES / CALCULATES:-
ECW percentage and ECW volume*
ICW percentage and ICW volume*
TBW percentage and TBW*
3rd space water
Body cell mass
ECW/TBW Nutrition index*
Plus normal percentage levels
Body fat percentage and fat weight
Body lean mass*
Dry lean mass*
Basal metabolic rate (BMR)*
BMR/Body weight
Average daily calorie requirement*
Waist /hip ratio
Body mass index plus normal range
Body fat mass index (BFMI) new
Fat free mass index (FFMI) new
Illness maker new
Impedance values at 5,50,100 and 200khz
Resistance 50khz new
Reactance 50khz new
Phase angle 50khz new
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