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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?
    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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