BUN (Blood Urea Nitrogen) – BUN measures urea nitrogen, a waste product from protein breakdown that your kidneys filter out.
What BUN measures
BUN measures how well your kidneys are clearing waste, alongside hydration and protein intake.
Typical ranges
Roughly 7-20 mg/dL, varying by lab, age, and hydration. Reference ranges differ between laboratories and by age and sex, so always read your result against the range printed on your own report.
What high results can mean
Can reflect reduced kidney function, dehydration, or high protein intake.
What low results can mean
Can reflect overhydration or low protein intake; usually less concerning.
How the test is done
A blood sample; often part of a metabolic or kidney panel. At-home collection works well for this marker when the sample is processed by a certified lab.
FAQ
What is a normal BUN level?
Roughly 7-20 mg/dL, varying by lab, age, and hydration. Your ideal target depends on your age, sex, and health history, so review results with a clinician.
What does a high BUN result mean?
Can reflect reduced kidney function, dehydration, or high protein intake.
Can I test BUN at home?
Yes. A blood sample; often part of a metabolic or kidney panel. An at-home sample processed by a certified lab gives reliable results.
This article is educational and not a substitute for medical advice. Discuss your results with a qualified clinician.