Comparison of several laboratory tests for quantifying azotaemia in dogs.

Fifty blood samples collected from 14 normal dogs and 11 dogs with renal disease and azotaemia were assayed in various ways for urea and creatinine. Urea concentrations measured by Azostix, Urastrat and Unitest correlated well with a reference urea assay method, and there was good correlation between creatinine concentrations determined by Unitest and a reference method. The performance of the four simpler laboratory procedures examined was considered satisfactory for clinical purposes.