What is a normal BUN level?
The short answer
A typical US lab prints a normal BUN range of 7–20 mg/dL. That range exists to catch disease, not to describe your best.
Nobody we follow has said what your BUN should be. It comes up on the shows, but never with a number.
What BUN measures
Urea nitrogen, a waste product from digesting protein that your kidneys filter out.
It rises when your kidneys clear less. Dehydration and a high-protein diet raise it too, which is why it goes alongside creatinine.
Checked against MedlinePlus — BUN (Blood Urea Nitrogen).
Common questions
What is a normal BUN level?
Most US labs print 7–20 mg/dL. Your report grades you against that range. It exists to catch disease, not to describe your best.
What does your BUN number mean?
On a typical lab range, under 7 mg/dL is low, 7 to 20 is normal and over 20 is high. Your own report prints its range next to your number, and that is the one your lab uses. Nobody we follow has drawn a line inside that range.
What does the BUN test measure?
Urea nitrogen, a waste product from digesting protein that your kidneys filter out. It rises when your kidneys clear less. Dehydration and a high-protein diet raise it too, which is why it goes alongside creatinine.
Why is there no target here?
Because nobody we follow has named a number for BUN. If that changes, it will be here.