6 doctors weighed in:

Does hydration affect egfr rate?

6 doctors weighed in
Dr. Robert Kwok
Pediatrics
4 doctors agree

In brief: Maybe if very ill

If a person is either mildly under-hydrated because he hadn't drank much fluids that day, normally hydrated, or mildly over-hydrated because he had drank a lot of fluids, his kidneys still should be working normally, so his blood test to estimate his GFR should still be valid.
If a person is very ill, and has quite abnormal hydration, his abnormal blood test results may not reflect his usual gfr.

In brief: Maybe if very ill

If a person is either mildly under-hydrated because he hadn't drank much fluids that day, normally hydrated, or mildly over-hydrated because he had drank a lot of fluids, his kidneys still should be working normally, so his blood test to estimate his GFR should still be valid.
If a person is very ill, and has quite abnormal hydration, his abnormal blood test results may not reflect his usual gfr.
Dr. Robert Kwok
Dr. Robert Kwok
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Dr. Gurmukh Singh
Pathology
1 doctor agrees

In brief: Not usually

If you are dehydrated to the extent of being sick from it, it usually does not affect eGFR. However, it is a good idea to drink plenty of water the morning of the test.

In brief: Not usually

If you are dehydrated to the extent of being sick from it, it usually does not affect eGFR. However, it is a good idea to drink plenty of water the morning of the test.
Dr. Gurmukh Singh
Dr. Gurmukh Singh
Thank
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