Body surface area

From Self-sufficiency
Jump to: navigation, search

In physiology and medicine, the body surface area (BSA) is the measured or calculated surface of a human body. For many clinical purposes BSA is a better indicator of metabolic mass than body weight because it is less affected by abnormal adipose mass. Estimation of BSA is simpler than many measures of volume.

Uses

Examples of uses of the BSA:

Calculation

Various calculations have been published to arrive at the BSA without direct measurement:

The Dubois & Dubois formula:[1]:

<math>{BSA (m^2)}=0.007184 \times {weight \mbox{ (kg)}}^{0.425} \times {height \mbox{ (cm)}}^{0.725}</math>

or alternatively expressed:

<math>{BSA (m^2)}=\frac{{weight \mbox{ (kg)}}^{0.425} \times {height \mbox{ (cm)}}^{0.725}}{139.2} </math>

One commonly used formula is the Mosteller formula, published in 1987[2] and adopted for use by the Pharmacy and Therapeutics Committee of the Cross Cancer Institute, Edmonton, Alberta, Canada:

<math>{BSA (m^2)}= \sqrt\frac{weight \mbox{ (kg)} \times height \mbox{ (cm)} }{3600}</math>

Other formulas include the Haycock formula[3]:

<math>{BSA (m^2)}=0.024265 \times {weight \mbox{ (kg)}}^{0.5378} \times {height \mbox{ (cm)}}^{0.3964}</math>

the Gehan and George formula[4]:

<math>{BSA (m^2)} = 0.0235 \times weight \mbox{ (kg)}^{0.51456} \times height \mbox{ (cm)}^{0.42246} </math>

the Boyd formula[5]:

<math>{BSA (m^2)} = 0.0003207
\times weight \mbox{ (g)}^{(0.7285 - 0.0188 \log_{10}{weight \mathrm{ (g)}})}
\times height \mbox{ (cm)}^{0.3}</math>

the Fujimoto formula[6]

<math>{BSA (m^2)} = 0.008883 \times height \mbox{ (cm)}^{0.663} \times weight \mbox{ (kg)}^{0.444}</math>

the Takahira Formula [7]

<math>{BSA (m^2)} = 0.007241 \times height \mbox{ (cm)}^{0.725} \times weight \mbox{ (kg)}^{0.425}</math>

Normal values

"Normal" BSA is generally taken to be 1.73 m² for an adult.

Average BSA values
Neonate (Newborn) 0.25
Child 2 years 0.5
Child 9 years 1.07
Child 10 years 1.14
Child 12-13 years 1.33
For men 1.9
For women 1.6

References

  1. Du Bois & Du Bois,Arch Intern Med 1916, 17:863
  2. Mosteller RD. "Simplified calculation of body-surface area". N Engl J Med 1987; 317:1098. PMID 3657876.
  3. Haycock GB, Schwartz GJ, Wisotsky DH "Geometric method for measuring body surface area: A height-weight formula validated in infants, children and adults" J Pediatr 1978, 93:62-66.
  4. Gehan EA, George SL, Cancer Chemother Rep 1970, 54:225-235
  5. "(from Boyd E, The growth of the surface area of the human body." Minneapolis: University of Minnesota Press, 1935.)
  6. Fujimoto S, Watanabe T, Sakamoto A, Yukawa K, Morimoto K. Studies on the physical surface area of Japanese. 18. Calculation formulae in three stages over all ages. Nippon Eiseigaku Zasshi 1968;5:443–50.
  7. Fujimoto S, Watanabe T, Sakamoto A, Yukawa K, Morimoto K. Studies on the physical surface area of Japanese. 18. Calculation formulae in three stages over all ages. Nippon Eiseigaku Zasshi 1968;5:443–50.

External links

es:Área de superficie corporal fr:Surface corporelle nl:Lichaamsoppervlak no:Kroppsoverflate pl:Powierzchnia ciała ru:Площадь поверхности тела