. A practical treatise on medical diagnosis for students and physicians . s prepared by dissolving 100 grammes ofsodium hydroxide in 250 of water, cooling the solution, and thenadding 25 of bromine. It is better, however, to prepare the hypobromite solution freshly foreach examination. This can readily be done by having a solution ofsodium hydroxide containing 6 ounces to a pint of water. It should bekept tightly corked with a rubber or paraffined stopper. The sodiumhydroxide solution is poured into the long tube of the ureometer to themark =, then ^ its volume of bromine is introduc
. A practical treatise on medical diagnosis for students and physicians . s prepared by dissolving 100 grammes ofsodium hydroxide in 250 of water, cooling the solution, and thenadding 25 of bromine. It is better, however, to prepare the hypobromite solution freshly foreach examination. This can readily be done by having a solution ofsodium hydroxide containing 6 ounces to a pint of water. It should bekept tightly corked with a rubber or paraffined stopper. The sodiumhydroxide solution is poured into the long tube of the ureometer to themark =, then ^ its volume of bromine is introduced by means of a 634 THE URINE. pipette, and sufficient water added to fill the long arm and the bend ofthe tube. The hypobromite solution should fill the tube completely, andany bubbles rising to the top of the tube should be removed before theintroduction of the urine. The pipette is then filled with the urine upto the 1 mark, any urine adhering to its surface being carefully wipedoff. The pipette is introduced carefully, so as not to compress the bulb Fig. Huffners ureometer. Doremus ureometer. until the point extends as high up as possible beyond the bend. Thebulb is now compressed slowly until 1 of urine has been of the urea occurs and bubbles of nitrogen rise to thesurface of the long arm of the tube; when bubbles of gas cease to beevolved, the volume of nitrogen gas is read off, and according to thegraduations on the tube considered as so many grains of urea per fluid-ounce of urine, or as so many milligrammes of urea in 1 , of urine,according to whether it is graduated in the English or in the metricsystem. Chlorides. The presence or absence of chlorides is sometimes ofdiagnostic value. They are increased when absorption of exudates ortransudates is going on, and in malarial fevers, diabetes insipidus, andBrights disease. They are diminished or absent in pneumonia duringits progressive stage, and in fevers. The chlorine of the
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