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February 7, 1903

Dr. Croftan's Iodin Starch Test for Adrenal Extract.

JAMA. 1903;XL(6):390. doi:10.1001/jama.1903.02490060044013

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Chicago, Jan. 29, 1903.

To the Editor:  —Dr. S. P. Kramer, under the above caption (The Journal, Jan. 24, p. 257), mentions the fact that a series of organ extracts and ferment solutions other than adrenal or hypernephroma extract possess the power of decolorizing iodin starch solution. The inference is that this test is, therefore, of no value in the differentiation of adrenal tumors of the kidney from other tumors of this organ.That the preparations enumerated by Dr. Kramer can decolorize iodin starch solution is known to me. The decolorization is, however, by no means so prompt nor so complete. I could supplement his list by a considerable number of other bodies with reducing properties that can do the same. The practical value of the hypernephroma test is not, however, impaired hereby. For, as I took pains to determine and as I expressly mentioned in my "Note," no other

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