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From , former About.com Guide

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Creatinine clearance

Overview Risks Results
Alternative Names:
GFR; Glomerular filtration rate
What the risks are:

The risks of the test are minimal and are related to the blood draw process. Rarely, the following will occur:

  • Excessive bleeding at blood draw site
  • Fainting or feeling light-headed
  • Hematoma (blood accumulating under the skin)
  • Infection (a slight risk any time the skin is broken)
  • Multiple punctures to locate veins
Special considerations:
Factors that may interfere with the accuracy of the test are as follows:
  • Incomplete urine collection
  • Pregnancy or vigorous exercise
Drugs that can interfere with creatinine clearance measurements include: cimetidine, trimethoprim, and nephrotoxic drugs, such as cephalosporins (cefoxitin).

Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.
Creatinine tests
Creatinine tests
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