He will also run laboratory tests, which include a complete blood count, the checking of blood urea nitrogen levels, and a biochemistry profile to check for organ functionality. (wagwalking.com)
As the disease progresses to a point where three quarters of the nephrons are not functioning, bloodwork starts to reveal changes — usually an increase in Blood Urea Nitrogen (BUN) and creatinine. (dogsnaturallymagazine.com)
Because it can no longer remove metabolic wastes especially the nitrogenous wastes resulting from protein metabolism, then these nitrogenous wastes lead to an increase in blood urea nitrogen. (mypetneedsthat.com)