The nurse calculates a client's body mass index (BMI). The client's height is 6 feet and 6 inches (198 cm) and the BMI is 30 (kg/m²). How should the nurse document the client's BMI? Reference Range: Body mass index [Normal: 18.0 to 24.9 kg/m²]

A BMI of 30 kg/m² falls exactly at the threshold for obesity according to standard classification. The World Health Organization and CDC categorize BMI as follows: underweight is below 18.5 kg/m², normal weight is 18.5 to 24.9 kg/m², overweight is 25.0 to 29.9 kg/m², and obesity is 30.0 kg/m² and above. Because this client's BMI is exactly 30, it meets the criterion for obesity and should be documented as such. The client's height of 6 feet 6 inches is provided as context but does not change the interpretation of the BMI value itself, since BMI already incorporates both height and weight in its calculation. Overweight would be incorrect because that category ends at 29.9 kg/m², and this client's value of 30 crosses into the obesity range. Underweight is far outside the applicable range. Normal weight would also be incorrect because the reference range provided in the stem ends at 24.9 kg/m², well below this client's BMI of 30. Students should remember that a BMI of exactly 30 is the lower boundary of obesity class I, not the upper boundary of overweight, making obesity the correct documentation.