What is the general normal range for blood urea nitrogen (BUN)?

The general normal range for blood urea nitrogen (BUN) is typically recognized as 10-20 mg/dL. This range reflects the concentration of urea nitrogen in the blood, which is an important marker of kidney function and can indicate how well the kidneys are filtering waste products.

The values of BUN can be influenced by various factors including hydration status, protein intake, and the presence of kidney disease. A BUN level that falls outside this normal range could suggest either an increased production of urea or a decreased excretion by the kidneys, thereby providing valuable information for clinical assessments.

Given that the correct range is identified as 10-20 mg/dL, the choice that includes this range is the most appropriate answer for this question. The other ranges provided do not accurately reflect the accepted normal limits for BUN, demonstrating why they are not suitable options.