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

The normal range for blood urea nitrogen (BUN) is typically accepted as 10-20 mg/dL. This range reflects the normal metabolic activity related to protein digestion and the liver's ability to convert ammonia into urea, which is then excreted by the kidneys. BUN levels can vary based on dietary protein intake, hydration status, and certain medical conditions.

A BUN level below this range may suggest a lower protein intake or excessive hydration, while levels exceeding this range can indicate issues such as impaired renal function, dehydration, or increased protein catabolism from various conditions. Understanding this normal range is crucial for assessing kidney function and overall metabolic status in patients, especially in acute care settings where quick evaluations are critical for treatment decisions.