Final answer:
In renal failure, both BUN and creatinine levels are typically elevated due to the kidneys not functioning properly.
Step-by-step explanation:
In renal failure, both blood urea nitrogen (BUN) and creatinine levels are typically elevated.
BUN is an estimate of urea in the blood and is an indicator of kidney function. In renal failure, the kidneys are not able to effectively filter urea out of the blood, leading to elevated BUN levels.
Creatinine is a waste product of muscle metabolism that is normally filtered out by the kidneys. In renal failure, the clearance of creatinine is reduced, resulting in elevated levels in the blood.