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This method was presented by title to the 1906 meeting of the Medical Society of the State of New York and published in the New York State Journal of Medicine, May, 1906. So many inquiries have been received regarding the test that it may be pardonable to repeat the substance of the original paper in diagrammatic form. The test is, of course, the same in principle as the original Boas test, which likewise is merely an adaptation to feces of the time-honored guaiac test for hemoglobin. The present modification avoids the delay and spurting of feces incident to extraction of fats which are inevitable when gasoline is not used. It seems to me neither more nor less delicate than the original Boas test. The guaiac test is not especially sensitive and nearly 10 per cent, of blood must be present in the feces
BENEDICT AL. THE BENEDICT MODIFICATION OF THE BOAS TEST FOR OCCULT BLOOD IN THE FECES.. JAMA. 1907;XLVIII(2):139. doi:10.1001/jama.1907.25220280051002b