. Essentials of laboratory diagnosis; designed for students and practitioners. st-tube with turbid urineand apply heat to the upper part. If the turbidity is due to thepresence of urates, the heated portion of the urine immediatelybecomes clear. >H : -j V-a-c--. % *:>*/ ;■;.-?, Fig. 42.—Urate of Soda axd Crystals of Uric Acid (*), Oxalateof Lime (o.», and Cystix (c). x 35 2. To some urine in a test-tube add some liquor the turbidity due to urates promptly disappears. Microscopic Appearance of Urates.—The uratic deposit iscomposed of fine, somewhat regular granules, usually
. Essentials of laboratory diagnosis; designed for students and practitioners. st-tube with turbid urineand apply heat to the upper part. If the turbidity is due to thepresence of urates, the heated portion of the urine immediatelybecomes clear. >H : -j V-a-c--. % *:>*/ ;■;.-?, Fig. 42.—Urate of Soda axd Crystals of Uric Acid (*), Oxalateof Lime (o.», and Cystix (c). x 35 2. To some urine in a test-tube add some liquor the turbidity due to urates promptly disappears. Microscopic Appearance of Urates.—The uratic deposit iscomposed of fine, somewhat regular granules, usually occurringin groups; sometimes the granules show spiny projections.( See Fig. 42.) Ammonium urate occurs only in alkaline urine,and is generally accompanied by a copious precipitation of triplephosphates. Ammonium urate appears as opaque brownish-redspherules with or without projecting spines. Significance.—The excess of urates is of no special im-portance : they are increased in most conditions, accompanied byfever, and in many disturbances of metabolism. PLATE VII. Uric Acid Crystals with Aiviorphous Urates.(After Peyer.) 450. IiiPPURic Arm. 253 HIPPURIC ACID. Hippuric arid, in combination with alkaline bases, is a nor-mal constituent of the urine. The average quantity eliminatedin twenty-four hours is one gram. This amount may be in-creased h\ exercise, by a vegetable diet, and by ingestion of ben-zoic acid. Id casts where the total excretion of urine is greatlydiminished, hippuric will be spontaneously thrown out of solu-tion. This is, however, a rare occurrence, because hippuric acidLS readily soluble in water. Microscopic Appearance.—The crystals are characteristicrhombic prisms, resembling in a measure the coffin-lid crystalsof triple phosphates. Hippuric acid crystals may, however, bedistinguished by the fact that they are precipitated in acidurine only, and also because they do not dissolve on the addi-tion of acetic acid. Phosphates, on the other hand, are p
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