II. Diagnosis: Obesity
-
Body Mass Index (BMI in kg/m2) Grading: Non-Asian Descent
- BMI 25 to 30: Overweight
- BMI 30 to 35: Class 1 Obesity
- BMI 35 to 40: Class 2 Obesity
- BMI >40: Class 3 Obesity (Severe Obesity)
-
Body Mass Index (BMI in kg/m2) Grading: Asian Descent
- BMI 23 to 27.5: Overweight
- BMI 27.5 to 32.5: Class 1 Obesity
- BMI 32.5 to 37.5: Class 2 Obesity
- BMI >37.5: Class 3 Obesity (Severe Obesity)
-
Waist Circumference
Overweight Criteria
- Female >=35 inches (>=31 in asian descent)
- Male >=40 inches (>=35 in asian descent)
- Body Fat Percent Overweight Criteria
- Female >= 32%
- Male >= 25%
- Prior Obesity definitions
- Men: 20% over estimated Ideal Weight
- Women: 30% over estimated Ideal Weight
III. Exam: Most useful Measurements
- Body Mass Index (BMI)
- Anthropometry
- Neck circumference (best predictor of Sleep Apnea)
- Men: >17 inch (42.5 cm) neck circumference
- Women: >16 inch (40.6 cm) neck circumference
IV. Exam: Other Measurements
- Skin-fold measurement
- Very operator dependent
- Normal subcutaneous fat
- Men: 11%
- Women: 18%
- Underwater weighing
- Gold standard
- Dependent on bone density
- Bioelectrical impedance
- Safe, noninvasive, fairly reliable
- Dependent on hydration
V. Resources
- Frank (1998) J Am Diet Assoc 98:S44-48 [PubMed]
- Keating (2024) Am Fam Physician 110(2): 145-56 [PubMed]
- Lyznicki (2001) Am Fam Physician 63(11):2185-96 [PubMed]
- Rippe (1998) J Am Diet Assoc 98:S9-15 [PubMed]
- Speer (1997) Phys Sportsmed 25:94-107 [PubMed]
- (1998) AOA Treatment Adult Obesity, 2nd edition
- (1998) Obesity Res 6(suppl 2):51S-209S