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I had gfr test. The first test results were 29 next time 34, does this change all the time? Could it stay above 15 for a long time?

The laboratory cannot differentiate between an estimated glomerular filtration rate (eGFR) of 29 and 34 milliliters per minute per 1.73 meters squared.  The accuracy of the laboratory testing is usually plus or minus 10, so these numbers are not different.   44 more words

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