1. How can my GFR be determined?
The best method for directly determining the GFR is a procedure called an "inulin clearance." It involves introducing a fluid containing the marker molecule inulin (NOT insulin) into your veins (IV – intravenous infusion) and then collecting timed urines over a period of hours. The urine volumes are noted and the inulin in each sample is measured to allow determination of the GFR. This test and other methods of determining GFR, such as those that use radioactive markers, are not routinely ordered and are primarily performed in a research setting.
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2. Could I calculate my own eGFR?
If you have had a recent
creatinine measurement, you can calculate the eGFR by using the calculator on the
National Kidney Foundation web site. If you have questions about the interpretation of your results, it is best to consult with your physician.
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3. Is an eGFR always calculated when a creatinine test is ordered?
This practice is recommended and is done by many laboratories but has not been universally adopted. The eGFR can always be calculated at your doctor's request.
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4. Why might my doctor repeat my eGFR test?
Besides periodic monitoring, your doctor might repeat your eGFR test if she feels that a temporary condition may be affecting your results.
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5. What other findings might suggest kidney dysfunction?
Diabetics and others at risk for developing
kidney disease may be monitored for small amounts of protein in their urine by performing a
microalbumin test. Protein, albumin, and blood in the urine can be signs of potential kidney damage.
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