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Creatinine tests measure the level of the waste product creatinine (say "kree-AT-uh-neen") in your blood and urine. These tests show how well your kidneys are working.
When the kidneys are not working well, they cannot filter creatinine from the blood. This causes the level of creatinine in the blood to go up and the creatinine clearance—the test that measures how well your kidneys remove creatinine—to go down.
A blood creatinine level or a creatinine clearance test is done to:
You may be asked to:
Tell your doctor about all the non-prescription and prescription medicines and natural health products you take. Some medicines and natural health products can affect the results of these tests.
If you are asked to collect urine, your doctor will give you a large container that holds about 4 litres. You will use the container to collect your urine for 24 hours.
You collect your urine for 24 hours.
A health professional takes a sample of your blood.
Watch closely for changes in your health, and be sure to contact your doctor or nurse call line if you have any problems.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if you are having problems. It's also a good idea to keep a list of the medicines you take. Ask your doctor when you can expect to have your test results.
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Current as of: August 11, 2019
Author: Healthwise Staff
Medical Review:Adam Husney MD - Family Medicine & Kathleen Romito MD - Family Medicine & Caroline S. Rhoads MD - Internal Medicine
Care instructions adapted under license by your healthcare professional. If you have questions about a medical condition or this instruction, always ask your healthcare professional. Healthwise, Incorporated disclaims any warranty or liability for your use of this information.
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