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February 23, 1929, Vol 92, No. 8 >

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ARTICLE | February 23, 1929

SEPARATE KIDNEY FUNCTION AND THE IMMISCIBLE BALANCE

William G. Exton, M.D.
JAMA. 1929;92(8):671-672. doi:10.1001/jama.1929.02700340071033.
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ABSTRACT

To the Editor:  —In his paper on "Separate Kidney Function" (The Journal, January 19, p. 228), Dr. L. C. Todd makes certain statements about determining the specific gravities of urine with the immiscible balance. For the sake of the many who use this method and apparatus I feel in duty bound to point out that Dr. Todd does not follow the method as I gave it in my original publication (Determination of the Specific Gravities of Minimal Amounts of Liquids [Blood, Urine, etc.], Tr. Am. Urol. A. 12:1920), and that his failure to follow the correct technic occasions unnecessary complications and difficulties which impair accuracy. In reviewing different methods for determining the specific gravity of small quantities of urine, Dr. Todd says:The third method, the immiscible balance, has proved entirely satisfactory and has the advantage of requiring the smallest amount of urine. Since our use of Exton's immiscible

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