Abstract: Method of determining total and direct bilirubin in blood serum or plasma. A first reagent containing sulfanilic and hydrochloric acids and a second reagent containing sulfanilic acid, hydrochloric acid and dimethyl sulfoxide are disposed in a scheme of reagent reservoirs. Into some of the reservoirs is also placed sodium nitrite contained in frangible capsules. The frangible capsules are broken with the resulting formation of a diazonium reagent. Blood serum or plasma, standard bilirubin solution and control serum are added to the reservoirs according to the analytical scheme. The subsequent color developments in the reservoirs are correlated to the bilirubin contents.

Abstract: A micro device for collecting blood from an individual or other blood source into a blood sampler cup, which cup has a removable vented top with a capillary tube passing through the top and contacting or proximate to the inside wall of the cup to deliver blood directly from the blood source to the cup.

Abstract: An improved means and method for the determination of blood urea nitrogen in blood serum or plasma. In brief, the means comprises a novel kit, particularly adapted to present a fresh reagent solution of diacetyl, thiosemicarbazide and anhydrous ethylene glycol in individual vessels for analysis and control procedures. The kit is particularly advantageous in that it permits the fresh preparation of reagents in predetermined volumes, for the determination of blood urea nitrogen. The method of the invention comprises employing the kit of the invention for the analysis of unknown specimens of blood serum or plasma.