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Also reported in: mmol/L
Your blood urea nitrogen is in the normal range, indicating a healthy balance between protein metabolism and kidney filtration.
BUN is made in the liver from protein breakdown. A very low level suggests the liver is very failing to process protein, or there is profound malnutrition. This is a rare but serious finding.
Seek urgent medical evaluation. Liver function tests and nutritional assessment are needed immediately.
BUN: {{value}} {{unit}} — very low (ref: {{low}}–{{high}})A low BUN usually reflects either a low protein diet, overhydration, or reduced liver function (since the liver makes urea). On its own it's rarely dangerous, but it provides useful context.
Ensure you're getting adequate dietary protein. If you have known liver disease, this should be discussed with your doctor.
BUN: {{value}} {{unit}} — below reference range (ref: {{low}}–{{high}})A borderline low BUN is often simply a sign of a low protein diet or excellent hydration. It is rarely clinically significant on its own.
Consider whether your protein intake is adequate. No urgent action needed.
BUN: {{value}} {{unit}} — borderline lowYour blood urea nitrogen is in the normal range, indicating a healthy balance between protein metabolism and kidney filtration.
No action needed. Stay hydrated and maintain adequate protein intake.
BUN: {{value}} {{unit}} — within reference rangeYour BUN sits in the healthy midrange, reflecting appropriate protein intake and well-functioning kidneys and liver.
No action needed. Keep up adequate hydration and balanced protein intake.
BUN: {{value}} {{unit}} — optimalA mildly elevated BUN is most often due to dehydration, a high protein diet, or simply concentrating urine. It can also be a mild indicator of reduced kidney filtration.
Ensure you're drinking enough water. If your creatinine and eGFR (a number that shows how well your kidneys filter your blood) are also abnormal, see your doctor for kidney function evaluation.
BUN: {{value}} {{unit}} — borderline highAn elevated BUN can indicate kidney impairment, dehydration, gastrointestinal bleeding, or very high protein intake. The kidneys aren't clearing urea as efficiently as they should.
See your doctor. BUN should be evaluated alongside creatinine and eGFR (a number that shows how well your kidneys filter your blood) to assess kidney function properly.
BUN: {{value}} {{unit}} — above reference range (ref: {{low}}–{{high}})At this level, BUN represents a noticeable accumulation of waste products in the blood — most likely due to acute or advanced kidney failure. This needs urgent medical attention requiring immediate intervention.
Seek emergency medical care immediately. Dialysis or urgent kidney support may be needed.
BUN: {{value}} {{unit}} — very high (ref: {{low}}–{{high}})Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.