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Also reported in: mmol/L
A normal BUN means the kidneys are effectively filtering urea (a byproduct of protein breakdown) from the blood. This result, in combination with creatinine and eGFR (a number that shows how well your kidneys filter your blood), provides reassurance about basic kidney function. Normal BUN reflects appropriate protein metabolism and adequate kidney filtration.
Blood urea nitrogen is a waste product from protein metabolism that the kidneys filter out. A very low BUN is typically seen in people with very low protein diets, overhydration, or certain liver conditions that impair urea production. It rarely indicates a kidney problem — in fact, it often means the kidneys are doing their job excellently.
Generally not concerning for kidney health. If accompanied by other liver markers or protein deficiency signs, discuss with your doctor.
BUN: {{value}} {{unit}} — very low (ref: {{low}}–{{high}})A low BUN most commonly reflects a low-protein diet, excellent hydration, or reduced protein catabolism. The kidneys are clearing urea normally — there is just less being produced. Low BUN in isolation is generally not a sign of kidney or metabolic disease.
Not a clinical concern in most cases. Ensure adequate dietary protein intake if low protein intake is suspected.
BUN: {{value}} {{unit}} — low (ref: {{low}}–{{high}})Borderline low BUN is a common benign finding, often reflecting vegetarian or low-protein dietary patterns, or simply good hydration status. The kidneys are functioning normally — there is simply less urea being generated from protein breakdown. This level does not indicate kidney disease.
No action needed. Ensure you are eating adequate dietary protein for your age and activity level.
BUN: {{value}} {{unit}} — borderline low (ref: {{low}}–{{high}})A normal BUN means the kidneys are effectively filtering urea (a byproduct of protein breakdown) from the blood. This result, in combination with creatinine and eGFR (a number that shows how well your kidneys filter your blood), provides reassurance about basic kidney function. Normal BUN reflects appropriate protein metabolism and adequate kidney filtration.
Good result. Maintain adequate hydration and a balanced diet to support kidney health.
BUN: {{value}} {{unit}} — normal (ref: {{low}}–{{high}})An optimal BUN in the middle of the normal range reflects well-balanced protein intake and healthy kidney clearance of nitrogen waste products. This is the ideal operating window for BUN, corresponding to normal protein metabolism without any evidence of kidney filtration impairment.
Excellent result. Continue balanced protein intake and good hydration to maintain this level.
BUN: {{value}} {{unit}} — optimal (ref: 8–18)A borderline elevated BUN can simply reflect mild dehydration, a high-protein diet, intense exercise, or early kidney filtering changes. On its own, a mildly elevated BUN without changes in creatinine or eGFR (a number that shows how well your kidneys filter your blood) is not typically diagnostic of kidney disease. The BUN-to-creatinine ratio helps determine whether dehydration or kidney dysfunction is one of several factors.
Increase water intake and retest. If BUN remains elevated alongside rising creatinine, inform your doctor for further kidney evaluation.
BUN: {{value}} {{unit}} — borderline elevated (ref: {{low}}–{{high}}; borderline: 20–25)An elevated BUN above 25 mg/dL indicates that protein waste products are accumulating faster than the kidneys can clear them. This can be caused by kidney disease, significant dehydration, gastrointestinal bleeding (which rapidly raises protein load), or high-protein dietary intake. When elevated alongside creatinine, kidney disease becomes more likely.
See your doctor for further evaluation. Hydration status, protein intake, creatinine, and eGFR (a number that shows how well your kidneys filter your blood) should all be reviewed together.
BUN: {{value}} {{unit}} — elevated (ref: {{low}}–{{high}}; elevated: >25)A very high BUN above 100 mg/dL signals noticeable kidney failure with massive accumulation of nitrogen waste products. Uremia — toxic accumulation of waste products — develops at high BUN levels and can cause confusion, nausea, seizures, and coma. This level is a medical emergency requiring immediate intervention.
Go to the emergency room immediately. Very high BUN may require emergency dialysis and urgent nephrology management.
BUN: {{value}} {{unit}} — very high (ref: {{low}}–{{high}}; critical: >100)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.