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High BUN indicates increased protein breakdown, which is associated with decreased immune function. A study shows that patients with elevated BUN (> 20 mg/dl) have an increased risk of infection (R). High BUN is associated with increased mortality in critically ill patients (R, R, R, R).
What is the normal level of BUN? Normal BUN levels differ with age and gender. A healthy male adult must have BUN levels from 8 to 24 mg/dL, while a healthy female adult should have it from 6 to 21mg/dL. The normal BUN levels for children fall between 5 and 18 mg/dL. Meanwhile, the healthy BUN level for pregnant women is from 5 to 12 mg/dL. The normal BUN levels for children and women are relatively low due to their bodiesâ ability to split up protein molecules. Oftentimes, the BUN test is done together with the Creatinine test to figure out renal problems.