Blood urea nitrogen to creatinine ratio

Blood urea nitrogen (BUN) and creatinine tests can be used together to find the BUN-to-creatinine ratio (BUN:creatinine). The level of creatinine in your blood also tells how well your kidneys are working-a high creatinine level may mean your kidneys are not working properly. A blood urea nitrogen (BUN) test is done to: Kidney disease or blockage of the flow of urine from your kidney causes both BUN and creatinine levels to go up.

See if treatment of your kidney disease is working.
See if your kidneys are working normally.
See if your kidney disease is getting worse.
Dehydration generally causes BUN levels to rise more than creatinine levels. This causes a high BUN-to-creatinine ratio. A BUN-to-creatinine ratio can help your doctor check for problems, such as dehydration, that may cause abnormal BUN and creatinine levels.
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