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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).
Blood Urea Nitrogen (BUN) is an indicator of kidney function. There are many factors that may cause elevated BUN level, such as diet, dehydration, infection or medicines.Someone may also have high body temperature with high BUN level.lood Urea Nitrogen (BUN) is an indicator of kidney function. There are many factors that may cause elevated BUN level, such as diet, dehydration, infection or medicines.