The creatinine clearance test compares the level of creatinine in urine with the creatinine level in the blood. (Creatinine is a breakdown product of creatine, which is an important part of muscle.) The test helps provide information on kidney function.
Creatinine - blood test
Creatinine - urine test
How the test is performed
This test requires both a blood and urine sample. You will collect your urine for 24 hours, and then have blood taken.
For information on giving a blood sample, see: venipuncture .
For information on how to collect the urine sample, see: 24-hour urine collection .
The samples are sent to a laboratory. The laboratory specialist measures the level of creatinine in both the urine and blood samples, and looks at how much urine you collected in 24 hours.
The clearance rate is then calculated. The calculation is adjusted for your specific body size.
The creatinine clearance...
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