What causes high BUN?
Reduced kidney function, dehydration, or a high-protein diet.
Diagnostics
BUN test explained
What blood urea nitrogen (BUN) measures and what a high value means.
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Short Answer
Blood urea nitrogen (BUN) measures urea, a waste product. A high BUN can reflect reduced kidney function, but also dehydration or high protein intake, so it is read with creatinine.
Medical Facts
- BUN measures urea, a waste product the kidneys clear.
- High BUN can also come from dehydration or a high-protein diet.
Treatment or Donation Options
- Read BUN together with creatinine and eGFR.
- Discuss trends with your doctor, not a single value.
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