Creatinine clearance is a method that estimates the glomerular filtration rate (GFR) of the kidneys. This is the amount of liquid filtered out of the blood that gets processed by the kidneys.

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... Why get tested?
To diagnose kidney malfunction

When to get tested?
If your doctor thinks that you may have a problem affecting the function of your kidneys, such as an obstruction within the kidney, acute or chronic kidney failure, dehydration, shock, or another disease, such as congestive heart failure

Sample required?
Both a urine sample (24-hour collection) and a blood sample drawn from a vein in your arm
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