imported>Meg Taylor |
imported>Peter Schmitt |
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| | '''Body surface area''' is estimated by:<ref name="pmid3657876">{{cite journal| author=Mosteller RD| title=Simplified calculation of body-surface area. | journal=N Engl J Med | year= 1987 | volume= 317 | issue= 17 | pages= 1098 | pmid=3657876 |
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| | | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&retmode=ref&cmd=prlinks&id=3657876 }} <!--Formatted by http://sumsearch.uthscsa.edu/cite/--></ref> |
| 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.
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| ==Uses== | | <math>m^2 = \sqrt{\frac{Height(inches) \times Weight (pounds)}{3131}}</math> |
| Examples of uses of the BSA:
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| *[[Renal function]] is usually fractioned over the BSA to gain an appreciation of the true required [[glomerular filtration rate]] (GFR);
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| *The [[Quetelet index]] uses a somewhat modified form of the BSA;
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| *The [[cardiac index]] is a measure of [[cardiac output]] divided by the BSA, giving a better approximation of the required cardiac output;
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| *[[Chemotherapy]] is often dosed according to the patient's BSA.
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| *[[Glucocorticoid]] dosing is also expressed in terms of BSA for calculating maintenance doses or to compare high dose use with maintenance requirement.
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| ==Calculation== | | ==References== |
| Various calculations have been published to arrive at the BSA without direct measurement, starting in 1916. The most commonly used is the Mosteller formula, published in 1987:
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| Metric (weight in [[kilogram|kg]] and height in [[centimetre|cm]]):
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| :<math>{x}= \sqrt\frac{\mbox{weight} \times \mbox{height} }{3600}</math>
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| Imperial (weight in [[pounds]], height in [[inch]]es):
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| :<math>{x}= \sqrt\frac{\mbox{weight} \times \mbox{height} }{3131}</math>
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| ==Normal values==
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| *'Normal' BSA is generally taken to be 1.7 m<sup>2</sup>.
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| *Average BSA for men: 1.9 m<sup>2</sup>
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| *Average BSA for women: 1.6 m<sup>2</sup>
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| *Average BSA for child (9 years): 1.07 m<sup>2</sup>
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| *Average BSA for child (10 years): 1.14 m<sup>2</sup>
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| *Average BSA for child (12-13 years): 1.33 m<sup>2</sup>
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