Manual of urine testing : including the physical characters, qualitative and quantitative examination of the urine together with the clinical information to be derived therefrom / by John Scott.

  • Scott, John
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: Manual of urine testing : including the physical characters, qualitative and quantitative examination of the urine together with the clinical information to be derived therefrom / by John Scott. Source: Wellcome Collection.

    35/68
    (B.)—For its Abnormal Constituents. Albumen—see before. Sugar—Tests for (i.e., Dextrose or Grape-Sugar.) Note.— Before testing for Sugar remove any Albumen by boiling and filtering. ]. Add Liquor Potassse (excess) and boil—Brown colour (Moore-Heller’s test). 2. Add Liquor Potassae (excess) and a sat. watery soln. of Picric Acid (defect) and boil=Brown-red colour of Picramic Acid (Johnson and Braun’s test). 3. Add Liquor Potassae (excess) and a solution of 'Copper Sulphate (defect—i.e., until the cuprous oxide formed ceases to dissolve) and boil=Reddish-orange pp. of Suboxide of Copper (Trommer’s test). This test according to some can be depended on only when reduc- tion occurs at a temperature below boiling; this, however, occurs only when the urine contains a relatively large proportion of sugar. 4. Add Liquor Potassae (excess) boil and filter (to remove Phosphates), and then add Fehling s Solution of Potassio-tartrate of Copper (defect) and boil = Reddish-orange pp. (Fehling’s test). Note.—As Fehling’s Solution is easily decomposed by exposure, it should by boiled alone before use, and if discolouration occurs do not use it. ia. Pavy’s Pellets. Place a pellet (Potassio-tartrate of Copper)—after removing its cover—in a test-tube with a drachm of water; heat till solution becomes clear and deep blue ; add an equal bulk of urine, and boil upper part of mixture = Red pp. 5. Add Liquor Potassae (excess)—if necessary, boil and filter (to remove Phosphates—the white phosphates would conceal the blackness of the reduced Bismuth) and then add Basic Nitrate of Bismuth, or even the Subnitrate, and boil for some time — grey or black pp. (of metallic Bismuth) (Bottcher’s test). In all the above tests Caustic Soda may be used for Caustic Potash; and in all except Bottcher’s, prolonged boiling is to be avoided, as reduction may occur in this way apart from sugar. Adding too much urine is also to be avoided, as the test-fluid should always be in excess ; and large quantities of non-saccharine urine may reduce the copper. 6. Fermentation Test.—(See later). May be used quali- tatively, but is not delicate, for Roberts says that