When is adjusted body weight used for dosing?

AdjBW is used for aminoglycosides, vancomycin loading, and some respiratory medications in obese patients (BMI >30 or actual weight >20% above IBW).

What is the 0.4 correction factor?

The 0.4 factor reflects that adipose tissue is ~40% as metabolically active as lean tissue for aminoglycoside distribution.

No — LBM is a different calculation. AdjBW specifically applies the 40% adipose correction for certain drug dosing purposes.

Calculate adjusted body weight (AdjBW = IBW + 0.4 × (actual weight - IBW)) for drug dosing in obese patients.

Use the full interactive calculator below, or

Ideal Body Weight

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BMI Adult

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BSA Calculator

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Vancomycin AUC

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