The use of blood urea nitrogen (BUN) concentration as a measure of renal function is even less reliable, because BUN levels can be affected by the presence of gastrointestinal bleeding or by the ...

Medically reviewed by Steffini Stalos, DO Your kidney function test results are a measure of how well your kidneys are working to filter your blood and remove excess water and waste from the body. For ...

Blood urea nitrogen (BUN) is a less specific indicator of kidney function and is a reflection of ingested protein and muscle catabolism. Elevated BUN can be precipitated by protein intake ...