The nurse is calculating the body mass index (BMI) to assess a client's weight. Which is a limitation to using this tool?
1. There is lack of correlation of the values in the BMI table with those in height-weight tables.
2. Assumption that all individuals have equal body composition at each given weight.
3. BMI is difficult to accurately calculate.
4. The BMI's use to determine the risk for obesity is reduced in individuals who are on reduced calorie diets.
Correct Answer: 2
A clinical limitation of body mass index is the assumption that all individuals have equal body composition at each given weight. This has not been found to be true. The amount of muscle mass, body fat, and bone mineral content varies according to high level of fitness, race, and ethnic differences. BMI is easily calculated using the standard formula and has a relationship with height and weight. The BMI is not used to determine the risk for obesity. The use of the tool is not limited by an individual's current caloric intake.
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