What Is the Normal Range for BUN-to-Creatinine Ratio?

By Staff WriterLast Updated Apr 3, 2020 4:17:42 AM ET

The typical adult range for the BUN-to-creatinine ratio is 1 unit of creatinine for every 10 to 20 units of blood-urea nitrogen, states Lab Tests Online. However, WebMD claims the levels are normal if the ratio falls between 6 and 25 units of blood-urea nitrogen per unit of creatinine.