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Normal bun rang4/12/2024 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. Significant liver damage or disease may inhibit the production of urea which can cause BUN concentrations to fall. High levels can be seen in people who have gastrointestinal bleeding, high protein diets, infection, and dehydration. 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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