#### II. Indication

1. Used in evaluation of Obesity

1. Highly correlated to body fat
2. May be best method available

1. Not accurate in muscular patients (athletes)
2. Not accurate in pregnancy or Lactation

#### V. Calculation

1. BMI = (weight in kilograms) / (height in Meters)^2
2. BMI = (weight in lbs x 700) / (height in Inches)^2
3. Approximating the weight at which BMI=27 (Obesity)
2. Add 5 pounds for every inch over 5 feet tall
4. Example: What weight is BMI=27 for 66 inch person?
5. Answer: 100 + (6x5) + 40 = 170 pounds

1. BMI <18.5: Underweight
2. BMI <20: Underweight or endurance athlete
3. BMI 20 to 22: Ideal Weight
4. BMI 22 to 25: Healthy Weight
5. BMI 25: Mild Obesity (WHO Grade 1, 110% Ideal Weight)
6. BMI 27: Moderate Obesity (120% of Ideal Weight)
7. BMI 30: Severe Obesity (WHO Grade 2, 130% Ideal Weight)
8. BMI 40: Morbid Obesity (WHO Grade 3)

#### VII. Interpretation: Boys (Derived from CDC BMI charts)

1. Approximation
1. Overweight BMI = (Age in years) + 14
2. Age 10
1. Mean BMI (50%): 17
2. At Risk BMI (>85%): 20
3. Overweight BMI (>95%): 23.5
3. Age 12
1. Mean BMI (50%): 18
2. At Risk BMI (>85%): 22
3. Overweight BMI (>95%): 25
4. Age 14
1. Mean BMI (50%): 19
2. At Risk BMI (>85%): 23
3. Overweight BMI (>95%): 27
5. Age 16
1. Mean BMI (50%): 20
2. At Risk BMI (>85%): 25
3. Overweight BMI (>95%): 29

#### VIII. Interpretation: Girls (Derived from CDC BMI charts)

1. Approximation
1. Overweight BMI = (Age in years) + 13
2. Age 10
1. Mean BMI (50%): 17
2. At Risk BMI (>85%): 20
3. Overweight BMI (>95%): 23
3. Age 12
1. Mean BMI (50%): 18
2. At Risk BMI (>85%): 22
3. Overweight BMI (>95%): 26
4. Age 14
1. Mean BMI (50%): 19
2. At Risk BMI (>85%): 24
3. Overweight BMI (>95%): 28
5. Age 16
1. Mean BMI (50%): 20
2. At Risk BMI (>85%): 25
3. Overweight BMI (>95%): 29

#### IX. Resources

1. NIH Obesity Education Initiative BMI Calculator
1. http://www.nhlbisupport.com/bmi/bmicalc.htm
2. CDC Growth Charts (source for childhood BMIs above)
1. http://www.cdc.gov/growthcharts
3. CDC Body Mass Index Information
1. http://www.cdc.gov/nccdphp/dnpa/obesity/bmi.htm

#### X. References

1. Green (1994) Bright Futures, NCEMCH, p. 266

### Ontology: Body mass index procedure (C0005893)

 Definition (MSH) An indicator of body density as determined by the relationship of BODY WEIGHT to BODY HEIGHT. BMI=weight (kg)/height squared (m2). BMI correlates with body fat (ADIPOSE TISSUE). Their relationship varies with age and gender. For adults, BMI falls into these categories: below 18.5 (underweight); 18.5-24.9 (normal); 25.0-29.9 (overweight); 30.0 and above (obese). (National Center for Health Statistics, Centers for Disease Control and Prevention) Concepts Diagnostic Procedure (T060) MSH D015992 English Body Mass Index, Index, Body Mass, Quetelets Index, Body mass index, BMI, body mass index (BMI), quetelet index, body mass index, Body mass index procedure, Quetelet Index, Quetelet's Index, Index, Quetelet Japanese ボディ・マス・インデックス, ﾎﾞﾃﾞｨﾏｽｲﾝﾃﾞｯｸｽ, Quetelet指数, ケトレー指数, 体重指数 Swedish Kroppsmasseindex Czech BMI, index tělesné hmotnosti, Body mass index Finnish Painoindeksi French Index de Quetelet, IMC (Indice de Masse Corporelle), Indice de masse corporelle, Indice de Quetelet, Index de masse corporelle Russian TELA MASSY INDEKS, KVETELETA INDEKS, КВЕТЕЛЕТА ИНДЕКС, ТЕЛА МАССЫ ИНДЕКС Italian Indice di Quetelet, Indice di massa corporea Croatian INDEKS TJELESNE MASE Polish Wskaźnik masy ciała, BMI Hungarian Testtömeg index Norwegian Kroppsmasseindeks, BMI Portuguese IMC, Índice de Massa Corpórea, Índice de massa corporal, Índice de Massa Corporal, Índice de Quetelet Spanish Índice de masa corporal, Índice de Masa Corporal, Índice de Quetelet German Koerpermassenindex, Quetelet-Index, Körpermasse-Index Dutch BMI, Body-mass index, Quetelet-index

### Ontology: Body mass index (C1305855)

 Definition (NCI) A general indicator of the body fat an individual is carrying based upon the ratio of weight to height. Definition (NCI_CDISC) A general indicator of the body fat an individual is carrying based upon the ratio of weight to height. (NCI) Definition (NCI_NCI-GLOSS) A measure that relates body weight to height. BMI is sometimes used to measure total body fat and whether a person is a healthy weight. Excess body fat is linked to an increased risk of some diseases including heart disease and some cancers. Concepts Clinical Attribute (T201) SnomedCT 60621009, 248359001, 162859006, 363807006, 140075008 LNC LP35925-4, MTHU017351 English Quetelet index, BODY MASS INDEX, Quetelet Index, body mass index (physical finding), body mass index, BMI, quetelet index, body mass index (BMI), Quetelet index (observable entity), Body mass index - observation, Body mass index (observable entity), BMI - Body mass index, Body mass index, Body mass index, NOS, Body mass index [dup] (observable entity), Body Mass Index Spanish índice de Quetelet, índice de Quetelet (entidad observable), IMC, índice de masa corporal (entidad observable), índice de masa corporal, BMI