What is considered a normal range for Blood Urea Nitrogen (BUN)?

The normal range for Blood Urea Nitrogen (BUN) is typically considered to be between 7 and 20 mg/dL, with some laboratories reporting a slightly broader standard. The answer provided, which is 9-20, falls within this acceptable range and reflects the common clinical understanding of BUN levels.

BUN is a waste product formed in the liver after protein metabolism and is largely excreted by the kidneys. Monitoring BUN levels is important for assessing kidney function as well as hydration status and protein intake. Elevated levels can indicate renal impairment, dehydration, or increased protein breakdown, while levels that are lower than normal may suggest liver disease or inadequate protein intake.

Understanding this range is crucial for identifying potential health issues in patients, making it key for nurse externs to recognize what constitutes a normal versus abnormal BUN value in their clinical assessments.