GFR kidney marker: GFR declines with age. What is considered "normal" at age 50 might be considered low at age 40. The commonly accepted cutoff for "chronic kidney disease" has been =90. If urine microalbumin/Cr is normal (not spilling protein in urine), urinalysis is normal, and GFR is stable, 89 likely to be OK.
Answered 10/23/2014
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