Overview & Description
This is a test of kidney function. It measures the amountof fluid filtered each minute by the kidneys.
Creatinine is made in the muscles and filtered throughthe kidneys. Almost all the creatinine released from the muscles makesits way into the urine as a waste product. Comparing the amount ofcreatinine in the blood with the amount of creatinine in the urine givesan idea of how well the kidneys are functioning.
Who is a candidate for the test?
Anyone whose has kidneys that may not be functioning wellmay need a creatinine clearance test.
How is the test performed?
This test is done with a urine sample gathered over a 24-hour period. The personshould follow the specific instructions of the doctor on how to collect theurine sample. In general, this schedule is followed:
The person will also have a blood sample doneso the blood level of creatinine can be measured and compared withthat found in the 24-hour urine sample.
Preparation & Expectations
What is involved in preparation for the test?
The person should request exact instructions from hisor her doctor.
Results and Values
What do the test results mean?
The healthy range of glomerular filtration rates forcreatinine clearance is as follows:
Abnormally low glomerular filtration rates may suggest:
Article type: xmedgeneral