Final answer:
The Blood urea nitrogen (BUN) test is an important renal diagnostic blood test used to evaluate the kidneys' ability to dispose of nitrogenous waste products and diagnose reversible glomerular problems.
Step-by-step explanation:
The Blood urea nitrogen (BUN) test is an important renal diagnostic blood test used to evaluate the kidneys' ability to dispose of nitrogenous waste products and diagnose reversible glomerular problems. This test measures the level of urea in the blood, which is an indicator of kidney function. Elevated BUN levels can indicate kidney dysfunction or glomerular problems.