Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . inary riders are equivalentto 2 1/2 per cent, of hemoglobin. It is not necessary for this determinationthat the room be absolutely dark. This method is accurate within the limit mentioned ( to 5 per cent.),but it is trying, time consuming, and does not equal in accuracy the methodsof Dare and of Sahli. The instrument is expensive and the disks are proneto deteriorate. Tallqvists Hemoglobinometer. Tallqvist has introduced a method for the estimation of hemoglobinwhich is so simple th
Diagnostic methods, chemical, bacteriological and microscopical, a text-book for students and practitioners . inary riders are equivalentto 2 1/2 per cent, of hemoglobin. It is not necessary for this determinationthat the room be absolutely dark. This method is accurate within the limit mentioned ( to 5 per cent.),but it is trying, time consuming, and does not equal in accuracy the methodsof Dare and of Sahli. The instrument is expensive and the disks are proneto deteriorate. Tallqvists Hemoglobinometer. Tallqvist has introduced a method for the estimation of hemoglobinwhich is so simple that certain writers have been led to recommend it aboveother methods. The principle of this method is essentially the same as Ohversmethod, although the application is entirely different. Tallqvist comparesthe color of the undiluted blood with that of a series of lithographed standardtints, which range by differences of 10° from 10 to 100 per cent. These stand-ard tints were prepared by matching in water colors the tint of the blood ofvarious patients (whose hemoglobin values had been determined with the. Fig. 130.—Tallqvists hemoglo-binometer. THE BLOOD. 425 von Fleischl instrument) v/hen soaked into standard filter-paper. These tintswere then lithographed and bound up with sheets of filter-paper, the com-bination making a very simple and convenient book which may be easily car-ried in the pocket. Method. Allow a fairly good-sized drop of blood to soak into a portion of the filter-paper by holding the edge of the sheet against the drop. Care should be takento allow this to take place very slowly so that the color may be uniform through-out. If carefully done it will not be necessary to blot the stain, but some-times this is essential. As soon as the stain has lost its humid gloss compareits color with that of the lithographed scale. Do not allow the stain to becomedry, as the color comparisons are disturbed by the coagulation. Hold thescale and the stained paper in such a wa
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