PEDIATRICS Vol. 25 No. 1 January 1960, pp. 170
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Letters to the Editor

NATHAN B. TALBOT M.D., ROBERT H. RICHIE M.D., and JOHN D. CRAWFORD M.D.

We note with interest that Drs. Hurst and Darrow agree that body fluid requirements of patients of differing sizes bear a simpler relation to weight raised to the two-thirds power than to weight directly.

"Surface area" is directly proportional to the two-thirds power of weight, being closely equal to weight in kgfrac23 X 0.1. We have used "surface area" thus defined as a basis for describing limits of tolerance and related physiologic data and for expressing dosages simply because this familiar body dimension has been found empirically to give reasonably satisfactory results.