Examination of the urine; a manual for students and practitioners . Fig. 32.—Hand centrifuge. tegrated, chemic deposits altered and dissolved, and cellsmay change beyond recognition in decomposing urine. Inorder to prevent this, the addition of a crystal of thymolor of a small quantity of saturated solution of boric acid ora drop or two of formalin may be added to the urine. Ofthese, thymol is as satisfactory as any other preservative, METHODS OF OBTAINING SEDIMENTS 237 but some workers prefer chloral, salicylic acid, chloroform,etc. The writer would warn against the use of formalin,especially
Examination of the urine; a manual for students and practitioners . Fig. 32.—Hand centrifuge. tegrated, chemic deposits altered and dissolved, and cellsmay change beyond recognition in decomposing urine. Inorder to prevent this, the addition of a crystal of thymolor of a small quantity of saturated solution of boric acid ora drop or two of formalin may be added to the urine. Ofthese, thymol is as satisfactory as any other preservative, METHODS OF OBTAINING SEDIMENTS 237 but some workers prefer chloral, salicylic acid, chloroform,etc. The writer would warn against the use of formalin,especially in excessive quantities, as it seriously interfereswith the examination (see p. 24). Centrifugal Method.—For accurate work, the use of acentrifuge for obtaining urinary sediments is almost in-dispensable. In this method the urine is placed in glass. Fig. 33-—Ball-bearing water-motor centrifuge. Fig. 34.—The Purdy electric cen-trifuge. tubes which are drawn out to a point, and revolved athigh speed in a centrifugal apparatus, thus depositing allsolids at the bottom of the tube in a few minutes. Imme-diate microscopic examination is then possible, and not onlyis there no danger of decomposition, but the sediment ismore concentrated, and thus one is sure to have all theelements deposited, irrespectively of the specific gravity ofthe urine or the character of the sediment. 238 EXAMINATION OF THE URINE The simplest centrifuge is operated by hand (Fig. 32)and is satisfactory for ordinary purposes when only afew examinations are to be made daily. It gives a speedof 3000 revolutions a minute at the maximum. A water-power centrifuge which can be con-nected to the ordinary faucet is anexcellent form of this apparatus(Fig. 33). It is very easy to operate,giving a smooth and rapid motionwithout much noise, and its price ismoderate. The m
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