Abstract: A method, composition and test device for the semiquantitative determination of specific gravity of a test sample are disclosed. The method utilizes a reagent composition capable of producing a detectable and measurable response that correlates to the concentration of cations, and therefore the specific gravity, of the test sample. The reagent composition comprises: a) a polyvalent metal ion having a valence of at least two, like mercuric ion or calcium ion; b) an indicator capable of interacting with the polyvalent metal ion to provide a polyvalent metal ion-indicator complex having a first color; c) a buffer; and d) a suitable carrier. The reagent composition is used in a wet phase specific gravity assay or is incorporated into a carrier matrix, like filter paper, to provide a test pad useful in a dry phase specific gravity assay of a test sample, such as urine.

Abstract: A carrying tray comprising a pair of end walls and a pair of side walls defining a rectangular space, a pair of half-shelves adapted to be received within the rectangular space for carrying objects thereon, and apparatus or rigidly securing the objects relative to the rectangular space. The half-shelves may be positioned at various heights to accommodate different sizes of object to be carried, such as flasks and containers.

Abstract: An assay for the detection of a peroxidatively active substance in a test sample. The assay employs a phenylenediamine and a naphthol which, under the conditions of the assay, couple to form a chromogen thereby indicating the presence of the analyte. The assay is carried out at a pH of from 10 to 14 since false positives due to ascorbate interference are minimized in highly alkaline media.