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Predicted Normal Weight (PNWT) Equation of Duffull et al for an Obese Patient

Purpose: To calculate the predicted normal weight (PNWT) for an adult using the equations of Duffull et al.

Description

Duffull et al developed an equation for predicting "normal weight" (PNWT) for an obese patient. This can be used in place of the actual body weight to more accurately calculate drug dosages and to perform other calculations. The authors are from the University of Queensland, Peter MacCallum Cancer Center and Monash University in Australia.


Age range for patients: 16 to 100 years of age

 

Parameters:

(1) actual body weight in kilograms

(2) height in meters

 

PNWT for female in kilograms =

= (1.75 * (body weight)) - (0.0242 * (body mass index) * (body weight)) - 12.6 =

= (1.75 * (body weight)) - (0.0242 * ((body weight)^2) / ((height)^2)) - 12.6 =

 

PNWT for male in kilograms =

= (1.57 * (body weight)) - (0.0183 * (body mass index) * (body weight)) - 10.5 =

= (1.57 * (body weight)) - (0.0183 * ((body weight)^2) / ((height)^2)) - 10.5 =

 

This is intended to be used for obese adults with a BMI > 30 kg per square meter.


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Objective

ICD-10