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# C alculation - PowerPoint PPT Presentation

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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### Calculation

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.

• 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

• 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 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

• 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)

• The Mosteller¹ formula

• In metric :

• or in inches and pounds: