On bedside urine-testing : a clinical guide to the observation of urine in the course of work / by Geo. Oliver.

  • George Oliver
Date:
1885
Catalogue details

Licence: Public Domain Mark

Credit: On bedside urine-testing : a clinical guide to the observation of urine in the course of work / by Geo. Oliver. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

    179/272 (page 169)
    Chap. IX.] WITH CARMINE & FEHLING. i6g the urine—uric, oxalic, lactic, &c,— reduce Fehling's solution. Of the substances apt to appear in the urine in disease, albumin, peptone, pus, mucus, blood1, bile, leucin and tyrosin do not react with either test; but dextrin and milk sugar as well as glucose reduce both. The carbohydrate, inosit, which has been detected in small quantity in the urine of some cases of diabetes and albuminuria, reacts with the carmine, and turns Fehling's solution green—a green precipitate falling, leaving the superna- tant liquid blue, but becoming green on reheating. Hence, Dr. Ralfe points out that the indigo-carmine test may be thus made available for distinguishing between those forms of sugar sometimes present in urine which give no reaction with copper, and which do not readily ferment, and so help to distinguish those cases from true glycosuria.2 It has been suggested to me that stale urine—which is the favourite reducing 1 The sugar contained in these fluids may reduce the tests.