Can the creatinine clearance test be wrong?

The creatinine clearance test is generally a reliable test. Creatinine clearance is only an estimate of GFR, and in some cases can provide a result that is higher than what your GFR really is. In addition, there are a few reasons that the results could be wrong. These include:

  • If you didn’t collect all urine samples as directed.
  • If the math formula used to figure out your creatinine clearance isn’t done correctly.

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