BUN/Creatinine Ratio
BUN/Creat Ratio
- Sample
- Blood
- Usual units
- ratio
Also known as BUN/Creat Ratio · BUN / Creatinine Ratio · BUN:Creatinine Ratio · BUN Creatinine Ratio · Urea/Creatinine Ratio
What this test measures
The BUN to creatinine ratio compares blood urea nitrogen with creatinine from the same sample. It is calculated by division and has no physical unit.
Reading your report
There isn’t one standard range for this test — each lab prints its own. Use the range shown next to your result.
Related guides
- Guide
Why the same blood test has different "normal" ranges at different labs
Reference intervals are built from each lab's own population and equipment, which is why two labs can print different ranges for the same sample.
- Guide
Reference interval, cutoff, and the "optimal" numbers online: three different things
The range beside your result, the target a website quotes, and the threshold that defines a condition are built in different ways and answer different questions.
- Guide
Why the same lab printed a different reference range for you this year
Ranges are not fixed constants. The lab can change method, revise its reference group, or apply a range that depends on your age — none of which is an error.
- Guide
Creatinine, eGFR and urea: one measured, the others worked out from it
A kidney panel prints a waste product, an estimate derived from it, and a second waste product measured separately. Which is which, and why eGFR can move when creatinine doesn't.
- Guide
What a "calculated" result means, and which of your numbers are one
Several values on a routine report were never measured — they are arithmetic on other rows. Which ones, how to spot them, and why it matters when they change.