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C alculation. IBW and ABW. Estimated ideal body weight in ( 18 YR and above)(kg ) Males: IBW = 50 kg + 2.3 kg for each inch over 5 feet. Females: IBW = 45.5 kg + 2.3 kg for each inch over 5 feet .

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ibw and abw
IBW and ABW

Estimated ideal body weight in ( 18 YR and above)(kg)Males: IBW = 50 kg + 2.3 kg for each inch over 5 feet.Females: IBW = 45.5 kg + 2.3 kg for each inch over 5 feet.

  • ABWEstimated adjusted body weight (kg)If the actual body weight is greater than 30% of the calculated IBW, calculate the adjusted body weight (ABW):

ABW = IBW + 0.4(actual weight - IBW)

  • The IBW and ABW are used to calculate medication dosages when the patient is obese.
  • This formula only applies to persons 60 inches (152 cm) or taller.
conversion
Conversion
  • 1 foot is equal to 12 inches
  • 1 inch is equal to 2.54 cm
  • 1 foot is equal to 30.48 cm
  • 5 foot is equal to 152.4 cm
  • 1 Ibis equal to 2.2 kg
examples
Examples
  • Example 1
  • Calculate the ideal body weight (IBW) of a man who is 64 inches tall and weighs 70 kilograms. If this man is obese (> IBW + 30%), calculate the adjusted body weight.
  • The man's actual weight is less than IBW + 30% so it is not necessary to calculate the adjusted body weight (ABW).

IBW = 50 kg + 2.3 x each inch over 5 feet (60inches)IBW = 50 kg + 2.3 x 4 inchesIBW = 50 kg + 9.2IBW = 59.2 kg

example
EXAMPLE
  • Example 2
  • Calculate the ideal body weight (IBW) of a woman who is 64 inches tall and weighs 80 kilograms. If this woman is obese (> IBW + 30%), calculate the adjusted body weight.
  • The woman's actual weight is greater than the IBW + 30%, so calculate the ABW:

ABW = 54.7 kg + 0.4( 80kg - 54.7 kg)

ABW = 54.7 kg + 0.4( 25.3 kg )ABW = 54.7 kg + 10.1kgABW = 64.8 kg

IBW = 45.5 kg + 2.3 x each inch over 5 feet (60inches)IBW = 45.5 kg + 2.3 x 4 inchesIBW = 45.5 kg + 9.2IBW = 54.7 kg

interpret bmi
Interpret BMI
  • under 18.5 you are considered underweight
  • from 18.5 to 24.9 are normal
  • from 25.0 to 29.9 are overweight
  • from 30.0 to 39.9 are obese
  • BMI over 40.0 is considered morbidly obese.
body surface area bsa
Body Surface Area (BSA)
  • The Mosteller¹ formula
    • In metric :
    • or in inches and pounds:
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