What happens if blood urea level is high? If your kidneys are not able to remove urea from the blood normally, your BUN level rises. Heart failure, dehydration, or a diet high in protein can also make your BUN level higher. Liver disease or damage can lower your BUN level. A low BUN level can occur normally in the second or third trimester of pregnancy. What does high Urea mean in a blood test? A blood urea nitrogen (BUN) test is used to determine how well your kidneys are working. It does this by measuring the amount of urea nitrogen in the blood. ... Normally, the kidneys filter out this waste, and urinating removes it from the body. BUN levels tend to increase when the kidneys or liver are damaged. What are the causes of high blood urea? Prerenal azotemia can be caused by decreased blood flow through the kidneys (e.g. low blood pressure, congestive heart failure, shock, bleeding, dehydration) or by increased production of urea in the liver via a high protein diet or increased protein catabolism (e.g. stress, fever, major illness, corticosteroid therapy). We are providing all Diagnostic Facilities in our center.... We have Ultramodern Songraphy Facility We have 2 D Echo Facility We have Doppler Facility We are doing All Pathology Tests We have Digital X-ray We have ECG facility Visit us @ "diagnosticcentrepune.in"