BMI AND BSA

Body Mass Index & Body Surface Area

two vital parameters frequently used in healthcare to assess and individual’s physiological state, guide clinical decisions, and optimize therapeutic interventions.

BSA

the total surface area of a person’s body, expressed in square meters (m²)

Mosteller firmula

a widely used formula due to its simplicity and accuracy in clinical practice

BMI

a measure of body fat based on a person’s weight relative to their height. it is expressed in kilograms per square meter (kg/m²)

Epidemiological studies

it helps in analyzing health trends in populations

underweight

bmi: <18.5

Normal weight

bmi: 18.5-24.9

Overweight

bmi: 25.0-29.9

Obesity Class I

bmi: 30.0-34.9

Obesity Class II

bmi: 35.0-39.9

Extreme Obesity Class III

bmi: ≥40.0

BSA

purpose: Tailoring drug dosages, physiological metrics

BMI

purpose: Categorizing body fat, assessing health risks

BMI

calculation: simple formula using weight and height

BSA

calculation: Complex formulas involving weight and height

BSA

clinical use: Individualized treatments, especially in pediatrics and oncology

BMI

clinical use: Population-based health assessments

BSA

considerations: Requires precise measurements, less affected by body composition

BSA

considerations: simpler but does not account for fat vs. muscle

BSA

not reflective of body composition

BMI

may misclassify muscular or lean individuals

Low risk

men (WHR): <0.90

women (WHR): <0.80

Moderate risk

men (WHR): 0.90-0.99

women (WHR): 0.80-0.84

High risk

men (WHR): ≥1.00

women (WHR): ≥0.85