All users should consult with a medical provider for specific health concerns. The creatinine test, also known as a creatinine lab test, creatinine blood test, and a kidney function test, measures the creatinine blood level. Creatinine is product of normal muscle metabolism in the body. Produced from creatine phosphate, creatinine is a commonly used marker to evaluate the health of the kidneys - its primary source of excretion from the body.
Specifically, creatinine levels are correlated with the glomerular filtration rate GFR in the kidneys because, after creatinine is filtered by the kidney, very little of it is reabsorbed. Your use of this information means that you agree to the Terms of Use.
Learn how we develop our content. To learn more about Healthwise, visit Healthwise. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. Updated visitor guidelines. You are here Home » Creatinine and Creatinine Clearance. Top of the page. Creatinine and Creatinine Clearance. Test Overview Creatinine and creatinine clearance tests measure the level of the waste product creatinine say "kree-AT-uh-neen" in your blood and urine.
Three types of tests can be done. Blood creatinine level The blood creatinine level shows how well your kidneys are working. Creatinine clearance A creatinine clearance test measures how well creatinine is removed from your blood by your kidneys.
Blood urea nitrogen-to-creatinine ratio This test measures the amount of urea in your blood. To find out if your kidney disease is changing. To see how well the kidneys work in people who take medicines that can cause kidney damage. To check for severe dehydration. Dehydration generally causes BUN levels to rise more than creatinine levels. This causes a high BUN-to-creatinine ratio.
Kidney disease or blocked urine flow from your kidney causes both BUN and creatinine levels to rise. How To Prepare You may be asked to: Not do any strenuous exercise for 2 days 48 hours before having the tests. Not eat more than 8 ounces of meat, especially beef, or other protein for 24 hours before the blood creatinine test and during the creatinine clearance urine test. Drink plenty of fluids if you are asked to collect your urine for 24 hours. But don't drink coffee or tea. These are diuretics that cause your body to pass more urine than normal.
How It Is Done Blood tests A health professional uses a needle to take a blood sample, usually from the arm. Timed urine test You collect your urine for a period of time, such as over 4 or 24 hours. When you first get up, you empty your bladder. Normal results. What do high and low creatinine levels mean? Latest news Scientists identify new cause of vascular injury in type 2 diabetes. Adolescent depression: Could school screening help?
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