I had to have a blood test about a week ago as a pre-op assessment. The hospital have come back and told me that there is a concerning problem with my eGFR which is reading as 34 (is that %?) and is down from 66 two weeks ago, when I had my usual blood test (I have one every month for an autoimmune condition). I am at a loss as to why this has happened. I don’t feel any different, nor do I feel ill, which I would have presumed I would do if my eGFR was that low? Am I correct in my presumption or can you have problems and not feel the effects. My kidneys are normally fine but I did have an episode in the past which saw my kidney functionality go down to 5 (I was ill and taking too much medication - once that was sorted my kidneys went back to functioning normally). Anyone able to put my mind at rest please? Just to add that I am having a new blood test tomorrow just to make sure everything is ok.