Total body weight (TBW)= Actual weight
May result in over dosing
Ideal body weight (IBW)= Calc. based on height & weight
May result in under dosing
Lean body weight (LBW)= Difference between TBW and fat mass
Technically best weight scalar for drug administration but difficult to accurately measure
Adjusted body weight (ABW) = Scalar derived from aminoglycoside pharmacokinetics (PK) in<unk> ty
May result in over dosing
May result in under dosing
Technically best weight scalar for drug administration but difficult to accurately measure
There are multiple formulas to estimate weight - these are the most common:
Estimated male TBW = 93.2 + 3.29[arm circumference (cm)] + 0.43[height (cm)]
Estimated female TBW = 64.6 + 2.15[arm circumference (cm)] + 0.54[height (cm)]
Estimated male IBW in kg = height in cm - 100
More accurate IBW estimate:
IBW (male) in kg = 50kg + 2.3kg for each in. over 5ft
Estimated female IBW in kg = height in cm - 105
More accurate IBW estimate:
IBW (female) in kg = 45kg + 2.3kg for each in. over 5ft
Estimated LBW = 1.3 x IBW
Estimated ABW = IBW + [C x(TBW-IBW)]
C = correction factor ususally 0.2 to 0.4
Apps/Online resources:
Epocrates has IBW calculator
Http://www.medcalc.com/body.html
More accurate IBW estimate:
IBW (male) in kg = 50kg + 2.3kg for each in. over 5ft
IBW (male) in kg = 50kg + 2.3kg for each in. over 5ft
More accurate IBW estimate:
IBW (female) in kg = 45kg + 2.3kg for each in. over 5ft
IBW (female) in kg = 45kg + 2.3kg for each in. over 5ft
C = correction factor ususally 0.2 to 0.4
Epocrates has IBW calculator
Http://www.medcalc.com/body.html
The obese patient
Asplenic patient
Combative patient
Severe anemia in Jehovah's Witness patients
Angiogram complications
The difficult airway
Urethritis in men
Procedures in patients with coagulopathies