What if BUN is normal but creatinine is high?

On By Tony Battle

What if BUN is normal but creatinine is high?

The ideal ratio of BUN to creatinine falls between 10-to-1 and 20-to-1. Having a ratio above this range could mean you may not be getting enough blood flow to your kidneys, and could have conditions such as congestive heart failure, dehydration, or gastrointestinal bleeding.

Is BUN and GFR the same thing?

BUN is not a reliable index of GFR. The kidney tubules reabsorb urea in quantities that vary depending on the state of hydration, thus rendering BUN an inaccurate marker for GFR. BUN concentration is also strongly affected by changes in catabolism and protein intake.

What does creatinine clearance tell you?

A creatinine clearance test measures how well creatinine is removed from your blood by your kidneys. This test gives better information than a blood creatinine test on how well your kidneys are working. The test is done on both a blood sample and on a sample of urine collected over 24 hours.

What is a creatinine clearance?

Definition. The creatinine clearance test helps provide information about how well the kidneys are working. The test compares the creatinine level in urine with the creatinine level in blood.

What is creatinine clearance?

What is the relationship between BUN and creatinine?

Dehydration generally causes BUN levels to rise more than creatinine levels. This causes a high BUN-to-creatinine ratio. Kidney disease or blockage of the flow of urine from your kidney causes both BUN and creatinine levels to go up.

How do you interpret BUN and creatinine?

Abstract

  1. Serum creatinine is the true assessment tool of renal function.
  2. BUN and serum creatinine are best interpreted together, comparing the two results.
  3. Normal BUN is 10 to 20 mg/100 mL and serum creatinine is 0.6 to 1.2 mg/100 mL.
  4. An extrarenal problem produces a BUN to serum creatinine ratio of greater than 25:1.

What is a creatinine clearance how must it be stored?

CREATININE CLEARANCE INSTRUCTIONS. Your physician has ordered a creatinine clearance. This test requires a 24-hour urine collection and a blood sample. The Lab has provided a container for storing the urine during the collection period. This container should be refrigerated at all times during the collection.

What lab test is BUN?

Overview. A common blood test, the blood urea nitrogen (BUN) test reveals important information about how well your kidneys are working. A BUN test measures the amount of urea nitrogen that’s in your blood.