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Elevated blood urea nitrogen (BUN) levels can result from various factors, including kidney dysfunction, which impairs the organ's ability to filter waste products from the blood. Dehydration can also lead to increased BUN due to reduced blood volume and concentration of urea. Other possible causes include high protein intake, gastrointestinal bleeding, and certain medications that affect kidney function. Additionally, conditions like heart failure or shock may decrease renal perfusion, contributing to elevated BUN levels.

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3d ago

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