. Urinary analysis and diagnosis by microscopical and chemical examination. liver being the chief seat of theformation of urea—in diseases of the kidney, and in chronic affectionsimpairing the vitality of the patient. Urea is frequently decreased in normal pregnancy. It is a common,and undoubtedly commendable practice to examine the urine for urea atstated intervals during pregnancy. Unfortunately, the many differentfactors which should be taken into account, such as diet, exercise, and Ithe condition of the gastro-intestinal tract, are frequently overlooked,!and unnecessary anxiety is caused
. Urinary analysis and diagnosis by microscopical and chemical examination. liver being the chief seat of theformation of urea—in diseases of the kidney, and in chronic affectionsimpairing the vitality of the patient. Urea is frequently decreased in normal pregnancy. It is a common,and undoubtedly commendable practice to examine the urine for urea atstated intervals during pregnancy. Unfortunately, the many differentfactors which should be taken into account, such as diet, exercise, and Ithe condition of the gastro-intestinal tract, are frequently overlooked,!and unnecessary anxiety is caused by a continued diminution in the! 20 JSOBMAL CONSTITUENTS. 21 amount of urea excreted. In these cases too much significance shouldnot be attached to the decreased amount of urea alone, but all the im-portant chemical tests, as well as thorough microscopical examination,must be resorted to before alarming the patient or her relatives. Urea is always held in solution and can never be found under themicroscope without chemical means. It crystallizes in the form of color-. Fig. 8 —Crystals of Urea (Upper Half) and Nitrate of Urea (LowerHalf) (X 200). less quadrilateral plates or prisms, and in needles of varying sizes. It isreadily soluble in water and alcohol, but is insoluble in ether. Urea caneasily be detected as nitrate of urea by placing a few drops of urine upon 22 UEINABY ANALYSIS AND DIAGNOSIS. a -lass slide, adding a drop of nitric acid, warming the slide carefully,and placing it aside to crystallize. Under the microscope more or lessregular rhombic or hexagonal plates, either single or overlapping eachother, may now be found. These plates have a little color and are per-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecturine, bookyear1906
