. A treatise on obstetrics for students and practitioners . he urineto be tested; pass the pipette into the apparatus, the point being placedimmediately under the long arm. Compress the India-rubber cap 126 PREGNANCY AND LABOR. slowly, and the gas which is liberated will thus pass up the longtube. It now collects in the upper part of the tube, and its volumebeing read off indicates the amount of urea from which it has beenevolved. In cases where there is much urea it is advisable to mix theurine with an equal amount of water before testing. In this case theresult will be equal to one-half of t
. A treatise on obstetrics for students and practitioners . he urineto be tested; pass the pipette into the apparatus, the point being placedimmediately under the long arm. Compress the India-rubber cap 126 PREGNANCY AND LABOR. slowly, and the gas which is liberated will thus pass up the longtube. It now collects in the upper part of the tube, and its volumebeing read off indicates the amount of urea from which it has beenevolved. In cases where there is much urea it is advisable to mix theurine with an equal amount of water before testing. In this case theresult will be equal to one-half of that indicated on the scale. Eachdivision of the instrument indicates gramme of urea in 1 ofurine. The percentage of urea is obtained by multiplying the result ofthe test by 100. To ascertain the total amount of urea voided intwenty-four hours multiply the result by the number of of urinepassed during that period. The instrument is also graduated to theEnglish scale, each division indicating one grain of urea per fluidounceof urine. Fig. Squibbs urea apparatus for the approximate estimation of urea in urine Another method which has been found very useful is that ofSquibb, who furnishes a ureometer of convenient form and moderateprice. This instrument is used in the following way : Provide a vessel of water large enough to immerse bottle A, thewater being at room-temperature, or about 18° C. =° F.—to beused as a cold bath. Put one end of the short rubber tube D on the bent glass tube ofthe stopper of the bottle B, and slip it on to the glass tube just so farthat when the bottle B is laid on its side, on its support, the free endof the rubber tube will just clear the bottom of the measuring-jar, asshown in the cut. Fill the bottle B with water at room-temperature and put the THE PATHOL00 Y OF PREGNANCY. 127 stopper firmly in place, allowing the displaced water to escape throughthe tubes; then taking the bottle in the right hand, with the forefingerover
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
