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Thread: Blood work for kidney function - can it be affected by hydration? ?

  1. #1
    Senior Member
    Join Date
    Feb 2004
    Ontario, Canada

    Question Blood work for kidney function - can it be affected by hydration? ?

    Perhaps this is a question for SCI Nurse, unless somebody else has knowledge on the topic. Does anyone know when you go for blood work to measure your kidney function, your GFR and your creatinine levels, whether the results of the blood work are directly affected by how much or how little you have drank prior to getting the blood work taken?

    For example, if you?re getting blood work taken at lunchtime and you got up at 6 AM and you pretty much haven't drank anything leading up to getting the blood work taken... would that produce a different result significantly versus had you been drinking a steady flow of water in some notable amount causing urination leading up to the blood work being taken?

  2. #2
    The answer is it depends on the bloodwork. Some of it should be drawn first thing in the morning before drinking anything - like a fasting blood sugar and other things it really doesn't impact. Kidney function is generally effected by not drinking.
    It is important for the prescriber to let you know if you should be fasting or not and also to let the lab know whether or not you have been fasting.

    The SCI-Nurses are advanced practice nurses specializing in SCI/D care. They are available to answer questions, provide education, and make suggestions which you should always discuss with your physician/primary health care provider before implementing. Medical diagnosis is not provided, nor do the SCI-Nurses provide nursing or medical care through their responses on the CareCure forums.

  3. #3
    Yes, if you're dehydrated your creatinine will be increased. Generally GFR is calculated directly from creatinine by most labs and thus will be decreased if you are dehydrated.

  4. #4
    Senior Member
    Join Date
    Feb 2004
    Ontario, Canada
    OK that’s what I figured. Thanks for the replies

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