With one kidney what to expect for "normal" test results.

I  am 68 year old male who had kidney removed in July due to cancerous tumor.  Stage 1 and grade 1 encapsulated tumor.  I see a Urologist, Kidney doctor, primary care doctor and an oncologist.  While currently there is no indication of cancer left, the oncologist is used as a second opinion to what the Urologist and kidney doctor tell me.  Today's appointment was the first time a medical professional told me what to expect blood and Urine tests to be for a person with one kidney.  She stressed that while it is possible to have all "normal" numbers with one kidney, that it is not likely.  She said I should expect Creatinine numbers to be in the 1.7 to 1.9 range as my new normal.  This of course means low eGFR numbers which would classify me as stage 3.  However to totally ignore the prognosis and studies about stage 3 CKD because these are not specific to a person with just one kidney.  All these are based upon people with two kidneys that are failing and rarely take into consideration the one kidney patient.  She also said the Universities and physicians are taking a hard look at the usefulness of eGFR.  That it is not a specific test since it just takes your Creatinine levels and applies it to a one time study of patients years ago.  And that the group it is based upon was not a good cross section.  That eGFR does NOT take into account if the kidney is damaged or capable of full function.  That here again it does not consider if 2 kidneys, or 1 kidney, or 1 perfectly normal kidney with 1 failing kidney.  It does not consider that all 68 year old males are not of the same stature nor the same weight.  eGFR is too general a classification.  She pointed me to this study http://jasn.asnjournals.org/content/19/5/844.full? which explains the faults of eGFR and how we look at stages of CKD.  For example for a person of 70 with stage 3 CKD, only a small percentage will progress to full blown kidney failure.  While it his much more likely in a younger person.  It is a great article.  It starts a little confusing but as you read the point is clear.  That eGFR alone should not bused to put you into a stage.  It recommends eliminating stage 1 and 2.  It sites that the worst part of the current staging system is it puts people into a classification and causes them extreme worry, when in actuality they have little to be worried about.  Interesting to get a different perspective.

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