Arpadi et al reported an equation for estimating total body water for an HIV-infected pediatric patient using bioelectrical impedance analysis. The authors are from St. Luke's Roosevelt Hospital Center and Columbia University.

Patient selection: age 4 to 11 years old, HIV-positive



(1) height in cm

(2) resistance in ohms


total body water in liters =

= EXP(X)


X =

= (0.05 * ((height)^2) / (resistance)) + 1.65

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