Sergi et al used bioelectrical impedance analysis (BIA) to estimate extracellular water in adults. The authors are from the University of Padova, Centro Universitario Grandi Apparecchiature Scientifiche, and Umberto I Hospital in Italy.
Patients: adults from 21 to 81 years of age
Analayiss: BIA at 1 kHz and 50 kHz
Parameters:
(1) height in centimeters
(2) weight in kilograms
(3) group designation (healthy or ill with CHF or CRF)
(4) sex
(5) resistance in Ohms at 1 kHz
(6) resistance in Ohms at 50 kHz
(7) reactance in Ohms at 50 kHz
Parameter
Finding
Points
group
healthy
1
ill
2
sex
male
0
female
1
ECW in liters =
= (0.34 * ((height)^2) / (resistance at 1 kHz)) + (0.06 * (weight)) + (2.63 * (points for group)) + (2.57 * (points for sex)) - 7.24
ECW in liters =
= (0.20 * ((height)^2) / (resistance at 50 kHz)) + (0.08 * (weight)) + (1.9 * (points for group)) + (1.86 * (points for sex)) - 5.22 + (0.005 * ((height)^2) / (reactance at 50 kHz))
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