A BUN test, or blood urea nitrogen test, can tell you a lot about how well your kidneys are working. Your kidneys' primary function is to eliminate waste and excess fluid from your body. This waste substance might build up in your blood if you have kidney disease. This can lead to serious health issues like high blood pressure, anaemia, and heart disease over time. The BUN test determines how much urea nitrogen is in your blood. The waste product urea nitrogen is removed from your blood by your kidneys. BUN levels that are higher than normal could indicate that your kidneys aren't performing properly.
