Low, but...: Gfr of 57 is on its low side for a 33-y-o female. But it's meaningful to look into if this is a report on its serial decline over time or just one sporadic solitary reading. The former suggests slowly worsening in kidney function; the latter may just reflect different status of hydration and lab error or variation, so repeating it under optimal hydration and health is advised. Ask doc timely.
Answered 3/19/2014
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