The answers to the questions about the client’s height and weight are needed to calculate the body mass index (BMI) (see Figure 5.2). The BMI is determined by considering a client’s weight in relation to height, and is a better indication of healthy ranges for body weight than weight alone. N.B. This calculation is unsuitable for use with babies, children, pregnant women, and amputees. In addition if an individual has a large amount of muscle mass he may be incorrectly identified as ‘obese’ on the BMI range. To calculate the BMI the following formula is used:
weight (kg)
BMI calculation = _______________
height2 (m)
For example:
If a female client’s weight is 50 kg and height is 1.68 m the BMI is:
50
____________
1.68 x 1.68 = 1 7.7
Reference ranges for a desirable BMI are:
• men: 20.5–25.0
• women: 19–24
• 25–30 = overweight
• above 30 = obese
The example above of 17.7 indicates that the client is underweight and therefore malnourished.
Whilst generally less accurate, Figure 5.1 offers an ‘at a glance chart’ to help determine the height/weight ratio.
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