![]() When the BUN is out of range, healthcare providers will often refer to the creatinine clearance test or BUN/creatinine ratio for a more accurate assessment. Small and large changes in BUN can occur from medications, dietary changes, and hydration status. Limitations of the test: The BUN test is a fast way to evaluate kidney function, but there are some limitations.When ordered as part of a basic or comprehensive metabolic panel, it can be used to evaluate a person's general health. BUN is usually used in conjunction with a creatinine test: The BUN test is primarily used along with the creatinine test to evaluate kidney function, as well as to monitor people with acute or chronic kidney dysfunction or failure.Before special tests: BUN tests may be ordered prior to some imaging studies like computed tomography (CT) scans and magnetic resonance imaging (MRIs) where contrast dyes that could damage the kidneys are used.Therefore, BUN is collected to monitor for kidney health and effectiveness of treatment in those who already have established kidney disease. Underlying health conditions: Diabetes and high blood pressure are two types of conditions that may affect the kidneys.Low levels of BUN may occur in people who have liver failure, women who are pregnant, and to those who are overly hydrated. The following are normal ranges for the substances tested: BUN: 6 to 20 mg/dL (2.14 to 7.14 mmol/L) CO2 (carbon dioxide): 23 to 29 mmol/L. Significant liver damage or disease may inhibit the production of urea which can cause BUN concentrations to fall. The basic metabolic panel typically measures these blood chemicals. The liver produces urea in the urea cycle as a waste product of the digestion of protein.Normal human adult blood should contain 7 to 18 mg/dL (0.388 to 1 mmol/L) of urea nitrogen. Abnormal BUN levels may indicate problems with liver or kidney functioning. Blood urea nitrogen (BUN) is a medical test that measures the amount of urea nitrogen found in blood. High levels can be seen in people who have gastrointestinal bleeding, high protein diets, infection, and dehydration. A BUN test measures the level of urea nitrogen in the blood using a standard blood sample. The liver may produce too much urea or the kidneys may not be able to filter the waste out of the blood, which can cause levels to be high. High or low levels can indicate a problem: Diseases that affect the kidneys or liver can change the amount of urea in the blood.This process produces ammonia, which is then converted into the less toxic waste product urea. Urea is a waste product formed in the liver when protein is metabolized. ![]() What the test measures: This test measures the amount of urea nitrogen in the blood.
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