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 ...

Kidney function tests evaluate how well your kidneys are functioning by measuring the levels of creatinine and blood urea nitrogen (BUN) in your blood. High levels of creatinine and BUN can be a ...

Blood tests: Blood tests such as serum creatinine and blood urea nitrogen (BUN) are commonly used to assess kidney function.