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Done physical test. How much is GFR likely to change with more hydration?

I recently had a physical and all of my labs came back at acceptable levels accept my creatine 1.1 and GFR 55. My doctor wants to retest my kidney function and told me to hydrate well before the test. How much is my GFR likely to change with more hydration? Also, I have severe urge incontinence . When I drink too much water, I have to urinate in large quantities every 20-30 mins. Won t this effect my hydration levels?
Asked On : Tue, 18 Dec 2012
Answers:  3 Views:  183
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Urologist 's  Response
Welcome to HCM.
Hydration is a prerequisite for proper kidney function and it is hard to quantify the change.
Incontinence is a bladder issue and has go nothing to do with the kidney.
Th basic fact is that kidneys need water to keep functioning, irrespective of how often you pass urine.
Best regards
Answered: Wed, 19 Dec 2012
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Nephrologist Dr. Ravi Bansal's  Response
hi there ,

it is important to note if you have hypertension or diabetes. gfr is slightly less . it is worth retesting. just by urinating more after drinking water you will not become dehydrated. also it may be worth testing GFR by DTPA scan which would give you a correct differencial GFR.

hope this helps,
Answered: Tue, 18 Dec 2012
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Nephrologist Dr. Aditya Bhabhe's  Response
Thanks for the query.
Hydration will change the results of the GFR only if you had been dehydrated when you checked it the first time. If the results are still the same it's better to see a nephrologist.
Also if you have urge incontinence it's better to get a urine analysis and an ultrasound to see for any underlying bladder problems.
Hope this helps
Good luck.
Answered: Wed, 19 Dec 2012
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