. Medical diagnosis for the student and practitioner. t, is raised to a level that nearly corresponds to that of uric acid andacid urates, when the test is applied by the first method. Of the two, the heat-and-nitric-acid test is the more definite and too often carried out, they are most misleading and fallible. Faulty Older Method.—It will be remembered that this method consistedin adding nitric acid, drop by drop, while boiling the urine. The following errors may result from such methods: (a) A small amount * The use of the horismascope (see Fig. 64) yields even better results. t
. Medical diagnosis for the student and practitioner. t, is raised to a level that nearly corresponds to that of uric acid andacid urates, when the test is applied by the first method. Of the two, the heat-and-nitric-acid test is the more definite and too often carried out, they are most misleading and fallible. Faulty Older Method.—It will be remembered that this method consistedin adding nitric acid, drop by drop, while boiling the urine. The following errors may result from such methods: (a) A small amount * The use of the horismascope (see Fig. 64) yields even better results. t According to C. E. Simon, the subsequent appearance of a film-like hoarfrost on thesides of the glass indicates that about 25 grams of urea are contained in a liter of the urineunder examination. Similarly spangles of this urea nitrate point to 45 grams, and the separa-tion of a dense mass to 50 or more grams to the liter. It must be remembered that suchdeductions are not of much value unless the specimen be a part of the twenty-four hours, Fig. 64. -Horismascope: adding the reagent.(Todd.) Robinsmethod. Relative valueof test. To beshunned. 220 MEDICAL DIAGNOSIS Soluble acid-albumin. Solublealkali- albuminate. Esbachs test. of albumin boiled with an excess of acid might form a soluble acid-albumin andescape detection* (b) In an alkaline or neutral urine with phosphates present in excess, afailure to acidify the specimen might result in the disappearance of any albuminpresent through the formation of a soluble alkali-albuminate, and neither acidnor alkali albuminates are precipitated by subsequent boiling. Furthermore, according to Purdy, mucin, globulin and albumoses areprecipitated by this method. The Potassium Ferrocyanide Test.—Into a clean test-tube pour a dramor two of acetic acid (50 per cent)., to this add twice its volume of an aqueoussolution of potassium ferrocyanide (1-20). Shake the mixture and overlaywith the suspected urine, as is done in the nitric ac
Size: 1468px × 1702px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1922
