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You should be retested in 3 months.  If this result remains the same, you may have chronic kidney disease (CKD).  You should also have urine testing for blood, protein, and infection.  This will help to define the extent of your kidney disease.    
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Did you know one in three American adults is at risk for kidney disease?  Anyone can get kidney disease at any time.  If kidney disease is found and treated early, you can help slow or even stop it from getting worse. Most people with early kidney disease do not have symptoms. That is why it is important to be tested.  Know your kidney numbers!    Your kidney numbers include 2 tests: ...
Most patients who start dialysis do so when they reach Stage 5 chronic kidney disease (CKD).  Stage 4 CKD means that you have an estimated glomerular filtration rate (eGFR) of between 15 and 29 milliliters per minute per 1.73 meters squared.  Stage 5 CKD is an eGFR of less than 15.  Hence, you have a ways to go.
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An estimated glomerular filtration rate (eGFR) of 49 milliliters per minute per 1.73 meters squared may be normal for an 85 year old.  I do not believe you need to see a nephrologist.  I believe your primary care physician can provide for your care.  I would only recommend a diet with no added salt for cooking and no added salt...
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These lab results are abnormal and if present for more than 3 months, then this could suggest that you have chronic kidney disease (CKD). I am unable to make any other diagnosis based on the tests you mention. I suggest the tests be repeated and if still abnormal in 3 months, further testing will be required.
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Drinking water will not cause changes in the glomerular filtration rate (GFR) unless you are dehydrated.  It is unlikely to change the kidney numbers.
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I am unable to interpret. I do not know of any way, other than in a research laboratory to reliably tell what the glomerular filtration rate (GFR) for each individual kidney might be. I suggest that you discuss this with the physician that ordered the test. Nuclear medicine scans can estimate percentage of function on each side but not true GFR in each kidney.
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A glomerular filtration rate (GFR) is the amount of a marker substance that is filtered by all of the glomeruli in the kidney and not reabsorbed by any of the tubules that ends up in the urine. To measure this exactly requires the administration of a marker substance such as inulin, iothalamate or other chemical marker that will exactly measure glomerular filtration rate (GFR). These tests are research tests done usually in a research laboratory...
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The numbers that you provide do not make any sense to me. I suggest that you go to our web site and re-calculate you estimated glomerular filtration rate (eGFR). You may do this at: http://kidney.org/professionals/kdoqi/gfr_calculator.cfm The numbers you provide to not seem correct.
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