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KIDNEY

Do you have access to your results online? You could check the lab results yourself. If not then go to your surgery and ask for a printout of the results. Alternatively, see your GP again.
 
Highly probably both and neither. Unless you have done the MRI and oxygen scan, the value they are quoting from blood tests as a kidney function % will be the eGFR. This is the ESTIMATED glomerular flow rate (I.e. fluid through kidneys) and is well known to be highly variable, and somewhat inaccurate. One result is pretty useless by itself, but an increasing or decreasing trend over several results is likely to be real.

For example, my GFR (no 'e') as of a month ago is 67.8. Over the last six months my eGFR has been between 30 and 60 so not only wrong but consistently low.
 
My eGFR over the last 3 years has consistently dropped from the high 60's down to fifty so I think it is a real effect.
 
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