NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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What formula is used for calculating Adjusted Body Weight?

IBW + 0.4(TBW-IBW)
IBW - 0.4(TBW-IBW)
IBW * 0.4(TBW-IBW)
IBW / 0.4(TBW-IBW)

The correct answer is: IBW + 0.4(TBW-IBW)

Adjusted Body Weight (ABW) is calculated to determine an appropriate dose of certain medications, especially for obese patients. The formula for calculating Adjusted Body Weight is IBW + 0.4(TBW - IBW), where IBW represents the Ideal Body Weight and TBW is the Total Body Weight. In this formula, the term 0.4(TBW - IBW) adjusts the IBW to account for the excess weight of the patient. By adding this adjusted value to the Ideal Body Weight, the result is an adjusted weight that helps in calculating medication dosages more accurately based on the patient's body composition. Option A provides the correct formula for calculating Adjusted Body Weight as it includes adding 0.4 times the difference between Total Body Weight and Ideal Body Weight to the Ideal Body Weight. This calculation ensures that the medication doses are appropriately adjusted for obese patients by taking into account the excess weight they carry beyond their ideal weight.