## What is the LeanBodyMass?

The Lean Body Mass (LBM) is a part of the body. It is normally defined to be the body weight minus the body fat. Typically lean body mass is 60-90% of the total body mass. Normally, men have higher port of lean body mass than women. Some anaesthetic agents dosage, especially water-soluble drugs, are routinely based on the lean body mass value. Many formulas have been developed in the past for the estimation of the lean body mass. The following are some of them. This calculator gives out result for all the fitting formulas.

## How is LeanBodyMass calculated formula?

In most situations, the BMR is estimated with equations summarized from statistical data. The most commonly used one is the Mifflin - St Jeor equation:

## Lean Body Mass Formula?

#### The Boer Formula:

Men: eLBM = 0.407weight(kg) + 0.267height(cm) - 19.2Women: eLBM = 0.252weight(kg) + 0.473height(cm) - 48.3

Boer P. "Estimated lean body mass as an index for normalization of body fluid volumes in man." Am J Physiol 1984; 247: F632-5

#### The James Formula:

Men: eLBM = 1.1weight(kg) - 128(weight(kg)/height(cm))2Women: eLBM = 1.07weight(kg) - 148(weight(kg)/height(cm))2

Absalom AR, Mani V, DeSmet T,et al. "Pharmacokinetic models for propofol-defining and illuminating the devil in the detail." Br J Anaesth 2009; 103:26-37

#### The Hume Formula:

Men: eLBM = 0.32810weight(kg) + 0.33929height(cm) - 29.5336Women: eLBM = 0.29569weight(kg) + 0.41813height(cm) - 43.2933

Hume, R "Prediction of lean body mass from height and weight.". J Clin Pathol. 1966 Jul; 19(4):389-91.