07-28-2021, 04:34 AM
This program should be useful for nursing and medical stuff to measure BSA
Program is adapted from HP-46 Sample Applications Section Medicine Page 66
The calculation is from the formula of DuBois D, DuBois EF. 1916
A formula to estimate the approximate surface area if height and weight be known.
Formula: LogA = (0.425 LogW) + (0.725 LogH) - 2.144
A = Body Surface Area in m²
W = Weight in kg.
H = Height in cm.
Weight - 4 kg.
Height - 35 cm.
[ BSA (Child) = 0.170 m² ]
Steps: W [R/S] H [R/S] display A in m²
Program:
Remark:
Today the easiest to calculate and remember is the Mosteller Formula by
taking the square root of the height (cm) mutiplied by the weight (kg) divided by 3600
BSA (m²) = √[ ( height x weight ) ÷ 3600 ]
The answer result accuracy from this formula almost comparible from DuBois formula.
Extra Examples:
What is the BSA for Mr. Joe weighing 210 pounds with a height of 6 feet, 3 inches?
►Calculate weight in kilograms: 210 pounds ÷ 2.2 = 95.45 kg
►Calculate height in centimeters: 6 feet, 3 inches = 75 inches x 2.54 cm/inch = 190.5 cm
95.45 [R/S] 190.5 [R/S] Display Result 2.24 m²
Gamo 7/2021
Program is adapted from HP-46 Sample Applications Section Medicine Page 66
The calculation is from the formula of DuBois D, DuBois EF. 1916
A formula to estimate the approximate surface area if height and weight be known.
Formula: LogA = (0.425 LogW) + (0.725 LogH) - 2.144
A = Body Surface Area in m²
W = Weight in kg.
H = Height in cm.
Weight - 4 kg.
Height - 35 cm.
[ BSA (Child) = 0.170 m² ]
Steps: W [R/S] H [R/S] display A in m²
Program:
Code:
01 LN
02 1
03 0
04 LN
05 STO 0 // Store Log Base Constant
06 ÷
07 STO 1 // Store LogW
08 R/S
09 LN
10 RCL 0
11 ÷
12 .
13 7
14 2
15 5
16 x // Calculate (0.725 LogH)
17 RCL 1
18 . // Decimal Point
19 4
20 2
21 5
22 x // Calculate (0.425 LogW)
23 + // Add both side together
24 2
25 . // Decimal Point
26 1
27 4
28 4
29 - // Subtraction Sign
30 1
31 0
32 X<>Y
33 Y^X // Calculate LogA
34 GTO 00
Remark:
Today the easiest to calculate and remember is the Mosteller Formula by
taking the square root of the height (cm) mutiplied by the weight (kg) divided by 3600
BSA (m²) = √[ ( height x weight ) ÷ 3600 ]
The answer result accuracy from this formula almost comparible from DuBois formula.
Extra Examples:
What is the BSA for Mr. Joe weighing 210 pounds with a height of 6 feet, 3 inches?
►Calculate weight in kilograms: 210 pounds ÷ 2.2 = 95.45 kg
►Calculate height in centimeters: 6 feet, 3 inches = 75 inches x 2.54 cm/inch = 190.5 cm
95.45 [R/S] 190.5 [R/S] Display Result 2.24 m²
Gamo 7/2021