High Blood Urea Nitrogen (BUN): what it means
A Blood Urea Nitrogen (BUN) result above the normal range is considered high. Here is what a raised Blood Urea Nitrogen (BUN) can point to, and when it is worth discussing with a doctor.
Reference range: 7–20 mg/dL; BUN/creatinine ratio >20 suggests dehydration or GI bleed
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What a high Blood Urea Nitrogen (BUN) can mean
- Dehydration — most common cause; ratio with creatinine is high.
- Chronic kidney disease — usually with elevated creatinine and reduced eGFR.
- Acute kidney injury — rapid rise of both BUN and creatinine.
- Upper gastrointestinal bleed — blood acts as a protein meal, raising BUN.
- High protein intake, corticosteroids — modest rises.
- Congestive heart failure — reduced renal perfusion.
When to discuss with a doctor
BUN elevation should always be interpreted with creatinine and eGFR. Mediora.AI computes the BUN/creatinine ratio when both values are present and uses it to flag the dehydration-vs-kidney-disease pattern.
How to bring a high Blood Urea Nitrogen (BUN) down
A raised Blood Urea Nitrogen (BUN) is not brought down by diet or habits. It reflects something else going on, so what actually helps is finding that cause with a doctor - the value follows once the cause is addressed.
General information, not a treatment plan - decisions about medication or target values belong with your doctor.
Conditions this can relate to
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Upload your test - freeMediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.