What Is Body Surface Area?

Human body surface area in square meters.

Body surface area

Right!

Human body surface area in square meters.

Chinese name

Body surface area

Definition

Body surface area

Unit

M2

Formula

SA = cH1W2

(1) There are many formulas for calculating the surface area of the human body, but most of them can be written in the form of (1) or (2). SA = cH1W2

(1) Here SA is the surface area of the human body (m2); H is the height (cm); W is the weight (kg); c, 1, 2 are constant terms. Take the natural logarithm on both sides of the equation, and you can linearize the formula (1) Into:

lnSA = 0 + 1lnH + 2lnW

(2) where 0 = lnc, ln is the natural logarithmic sign.

In 1916, the height, weight and body surface area of 9 observers were directly measured by DuBois and others.The minimum coefficient of variation method was used to establish the first recognized human body surface area calculation formula (1), which is still widely used. Gehan in 1975 And George used 401 cases of height, weight, and body surface area directly measured by Boyd and others, and applied the least square method to fit Equation (2) [1]. In 1987, Mosteller gave a simple formula that is easy to remember (c = 1/60) [2]. In 1973, Stevenson proposed a bivariate linear formula for estimating the surface area from height and weight based on measured data from 10 cases (3). In the 1980s, Zhao Songshan et al. (4, 5) reported China Calculation formulas for adult men and women. The calculation formulas introduced in most domestic textbooks are:

SA = 0.035W + 0.1 (W30) 1.05+ (W-30) × 0.02 (W> 30)

(2) Xu Wensheng's formula:

Body surface area (m2) = 0.0061 × height (cm) + 0.0128 × weight (kg) -0.1529

Example: A person is 168cm tall and weighs 55kg. Try to calculate the body surface area.

Solution: 0.0061 × 168 + 0.0128 × 55-0.1529 = 1.576m2 The male and female body surface area calculation formulas are: S male = 0.0057 × height + 0.0121 × weight + 0.0882, S female = 0.0073 × height + 0.0127 × weight-0.2106, if not The general formula for distinguishing between men and women is S = 0.0061 × height + 0.0124 × weight-0.0099. (S indicates body surface area, unit: m2; H indicates height, unit: cm; W indicates weight, unit: kg)