It is calculated by dividing the patient body mass (kg) by the square of his/her height (m).
BMI = kg/m2
Classification of weight status:
||Obesity Class||Risk of Disease|
|Extreme Obesity||> 40||III||Extremely high|
Obesity is defined as a BMI varying from 30-39.9 kg/m2. It is further classified into grades I, II and III. Extreme obesity with a BMI of greater than 40 is also called as morbid obesity. As seen on the right side of the table above, being overweight and the various classes of obesity is closely related to the risk of cardiovascular diseases.
The BMI is also used to categorize patient for appropriate therapies. The latter can range from lifestyle modifications for overweight, pharmacotherapy for obese and surgery for extremely obese patients.