. Essentials of laboratory diagnosis; designed for students and practitioners. by the factor Example.—Specific gravity before fermentation .... 1041Specific gravity after fermentation ...... 1023 Degrees of density lost 18 This is approximately the grains of glucose in each ounce of urine;18 x equals glucose. This test is easily performed, and is conclusive evidence ofthe presence of glucose. It is, however, not strictly accurate, andis not to be relied upon when the amount of glucose present isless than per cent. POLAEIMETEIC METHOD. 277 POLARIMETRIC METHOD. Because of
. Essentials of laboratory diagnosis; designed for students and practitioners. by the factor Example.—Specific gravity before fermentation .... 1041Specific gravity after fermentation ...... 1023 Degrees of density lost 18 This is approximately the grains of glucose in each ounce of urine;18 x equals glucose. This test is easily performed, and is conclusive evidence ofthe presence of glucose. It is, however, not strictly accurate, andis not to be relied upon when the amount of glucose present isless than per cent. POLAEIMETEIC METHOD. 277 POLARIMETRIC METHOD. Because of its ability to turn the ray of polarized light tothe right, glucose is called dextrose. The accurate determinationof glucose in urine may be made by those possessing a polari-scope. The degree of dextro-rotation can be read on a gradu-ated scale and calculated as percentage or grams of glucose. Since albumin in solution deflects the polarized ray to theright, this must first be removed by acidulating, boiling, andfiltering. To make an accurate estimation the urine must be. Fig. 47.—Polarimeter. (A. H. T. Co.) first decolorized by shaking with a piece of lead acetate andfiltering. Delicacy.—Instruments vary in delicacy. Usually dis-tinct dextro-rotation may be detected when glucose is present per cent. Fallacy.—Maltose, which rarely occurs in the urine, ifpresent, will deflect the ray even more than will glucose. (For description of teclmic see larger works on clinicalchemistry or polarimetry.) CLINICAL SIGNIFICANCE OF GLYCOSURIA. The presence of glucose in the urine is pathologic. If theamount be abundant and persists, associated with copious water-drinking and eating, while the patient is at the same timeemaciating, it is indicative of diabetes mellitus. The urine inthis condition is usually pale with a fruity odor, and while over- 278 THE URINE. abundant, has a high specific gravity. As much as 10,000 cubiccentimeters of urine may be excreted in twenty-four ho
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