. The examination of the urine of the horse and man . endency todissolve themAt timesthey will notsettle forhours. Usu-ally if al-lowed tostand s i xhours, thecasts will set--le if they arepresent. The centrifuge will bring them down in a few minutes. A low powerof the microscope (150-200 diameters) may be used in the searchfor casts and will enable the observer to pass over the field quiterapidly. To identify the cast and its structure, a power of 400-500 diameters is required. More than one specimen must alwaysbe examined before giving a positive statement as to the presenceor absence of cas
. The examination of the urine of the horse and man . endency todissolve themAt timesthey will notsettle forhours. Usu-ally if al-lowed tostand s i xhours, thecasts will set--le if they arepresent. The centrifuge will bring them down in a few minutes. A low powerof the microscope (150-200 diameters) may be used in the searchfor casts and will enable the observer to pass over the field quiterapidly. To identify the cast and its structure, a power of 400-500 diameters is required. More than one specimen must alwaysbe examined before giving a positive statement as to the presenceor absence of casts. False or pseudo-casts have been described;these are believed to be accidental formations, while true casts ingeneral indicate nephritis. True casts may appear in three different sizes according tothe portion of the tubule in which they are formed. The smallestsize originates in the narrow tubule. The next in size comes fromthe convoluted tubule of the second order (no casts from theconvoluted tubule of the first order, i. e., that portion of the. Fig. 24. a. Blood cast and hyaline cast carryingblood cells, b. Pus cast. c. Hyaline cast carrying epi-thelial cells, d. Epithelial casts. (Greene). 70 tubule nearest the glomerules, appear in tlie urine, because theyare too large to pass through the narrow tubules). The third andlargest are those developing in the straight collecting is believed a prognostic value may be attached to the size ofthe casts as well as to their number. Casts from the narrowtubules indicate a mild attack; from the convoluted tubules asevere form, especially in the cortex of the kidney; from thecollecting tubules, with the other forms also present, a seriouscondition of general renal inflammation or unfavorable identity of casts may generally be determined by their uni-form width. They are usually longer than they are broad, andhave one well-rounded extremity and well defined borders. True castsare of six va-rieties ; hya-line, e
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Keywords: ., bookcentury1900, bookdecade1910, bookidexaminat, booksubjecturine
