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An_246893 posted:
My grandmother found out today that only 30% of her kidney is functioning. She only has one kidney because her other was removed after having cancer. Does anybody know about situations like this?
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John-SKPT responded:
Renal function naturally declines slowly as we age; you really never see "100%" function except maybe in a very healthy 14 year old.

But, depending on her age, 30% residual function might be a concern.

The real question here is how fast--or how slow--the decline in function is happening. This requires tracking the lab results over years, over decades. If it hovers around 30% for a number of years, then she may have a normal life without a lot of trouble. If it declines from 30% to 20% in a year or less, then that's serious.

She probably should consult a nephrologist, at least to get some baseline values established and tracked over time.


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