Urea nitrogen/Creatinine

This test calculates the ratio of blood urea nitrogen (BUN) to creatinine, both waste products filtered by the kidneys. The ratio helps distinguish different causes of abnormal kidney function. A high ratio may suggest dehydration, excessive protein breakdown, or reduced kidney blood flow, while a low ratio can indicate liver disease or malnutrition. This ratio is more informative than either value alone in determining kidney dysfunction patterns.