What Is a BUN-to-Creatinine Ratio Blood Test?

By Staff WriterLast Updated Mar 27, 2020 1:24:32 PM ET

A BUN/Creatinine Ratio blood test is used in the differential diagnosis of acute or chronic renal disease, the diagnosis of reduced renal profusion, gastrointestinal bleeding, trauma, liver disease and urinary tract obstructions, according to Quest Diagnostics. The test looks for changes in the ratio of blood urea nitrogen to creatinine.