[Estimation of the concentration of urea in the blood of horses, cattle, goats and dogs using the "Merckognost Harnstoff" method compared with an enzymatic, photometric method (author's transl)].

To examine the suitability and reliability in field use of the "Merckognost Harnstoff" method in estimating the concentration of urea in the blood of horses, cattle, goats and dogs, the levels determined by this procedure were compared with those determined by an enzymatic (urease) photometric method widely used in laboratories. It was concluded from the results obtained that estimation using the "Merckognost Harnstoff" is sufficiently reliable for the rapid assay of urea in the blood under field conditions.