Urea is a waste product it is produced as your body digests protein and is carried by the blood to your kidneys, which filter the urea out of the blood and into urine.
This test looks at how well your kidneys are functioning.
High urea levels suggest poor kidney function. This may be due to acute or chronic kidney disease. However, there are many things besides kidney disease that can affect urea levels such as stress, recent heart attack or severe burns; bleeding from the gastrointestinal tract; conditions that cause obstruction of urine flow or dehydration.
Low urea levels are not common and are not usually a cause for concern. They can be with low protein diets, excess hydration malnutrition or liver failure. Low urea levels are also seen in normal pregnancy.