body_mass_index_bsa: Body Mass Index (BMI) and Body Surface Area (BSA)

In cliot: Clinical Indices and Outcomes Tools

Body Mass Index (BMI) and Body Surface Area (BSA)

Description

Calculates the Body Mass Index (BMI) and estimates Body Surface Area (BSA) using five common formulas (Mosteller, Du Bois, Haycock, Gehan-George, and Boyd). These metrics are fundamental for dosing medications (e.g., chemotherapy), assessing nutritional status, and stratifying obesity risks.

Usage

body_mass_index_bsa(weight_kg, height_cm)

Arguments

weight_kg	Numeric. Patient weight in kilograms.
height_cm	Numeric. Patient height in centimeters.

Value

A list containing:

BMI_kg_m2	Calculated BMI (Weight / Height^2).
BMI_Category	Classification based on WHO guidelines (Underweight, Normal, Overweight, Obesity Class I-III).
BSA_Mosteller_m2	BSA calculated using the Mosteller formula (Standard for many applications).
BSA_DuBois_m2	BSA calculated using the Du Bois & Du Bois formula.
BSA_Haycock_m2	BSA calculated using the Haycock formula (Often preferred in pediatrics).
BSA_Gehan_George_m2	BSA calculated using the Gehan-George formula.
BSA_Boyd_m2	BSA calculated using the Boyd formula.

References

Mosteller RD. Simplified calculation of body-surface area. N Engl J Med. 1987;317(17):1098. doi:10.1056/NEJM198710223171717

Du Bois D, Du Bois EF. A formula to estimate the approximate surface area if height and weight be known. Arch Intern Med. 1916;17(6):863-871.

Examples

# Example 1: Average Adult
# 75 kg, 175 cm
body_mass_index_bsa(75, 175)

# Example 2: Child
# 30 kg, 130 cm
body_mass_index_bsa(30, 130)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.