Skip to content

    Announcements

    Exciting News for WebMD Members!

    We've been busy behind the scenes building new message boards for you. You'll have new and easier ways to find messages, connect with others, and share your stories.

    And, this will all be available on your smartphone or other mobile device!

    What Do You Need to Do?

    The message board you're used to will be closing in the coming weeks. While many of your boards will be making the move to our new home, your posts will not. Want to keep a discussion going? Save posts you want to continue (this includes your member profile story), so that you can re-post them in the new message boards.

    Keep an eye here and on your email inbox, we'll be back in touch soon to give you all the information you need!


    Yours in health,
    WebMD Message Boards Management

    Have you had a kidney transplant or are waiting for one? Then visit the Organ Transplant Community and the Diabetes and Kidney Community to share your experiences with other community members!

    Are you newly diagnosed? Use the WebMD search engine to read articles like Understanding Kidney Disease.
    Kidney Function
    avatar
    kcpoe posted:
    My family members' doctor told her her kidney function is at 40%. The doctor has only done bloodwork, no other tests. How could he come up with this number?
    Was this Helpful?
    0 of 0 found this helpful
    Reply
     
    avatar
    mrscora01 responded:
    There are specific blood tests that test kidney function. Things like creatinine and urea as well as electrolyte levels will indicate how well your kidneys are working.

    Cora
     
    avatar
    john-skpt responded:
    The number that he gave is not really a "percentage" value, but most docs treat it that way. This is an eGFR, e for estimated, glomerular filtration rate for GFR. The key word here is "estimated". The number should really be expressed as ml/min/1.72 meters squared, not as 'percent', but no doc wants to try to make a patient understand that; it's just too complex. So they oversimplify and call it "percent". This estimated number is calculated only from blood numbers, so it is a bit less accurate that test that compare blood and urine values.

    A true measurement for GFR is somewhat tedious and time consuming to do, so most docs rely on the fast and easy eGFR. And in most cases, the results are good enough.

    All of that said, and recalling that the number is not really 40 percent on a 0-100% scale, but 40 ml/min on a scale that really tops out at about 60 ml/min, 40 is somewhat reduced from the ideal level. Also bear in mind that everybody naturally loses a bit of renal function with age, so that needs to be accounted for. A level of 40 in an 80 year old is less of a concern than a level 40 in a 20 year old.

    It probably does merit attention, if only to eliminate or reduce potential causes of additional damage in coming years.


    Spotlight: Member Stories

    My kidney experience includes many decades pre-dialysis, one year on hemo, an attempt at PD, and then transplant

    Helpful Tips

    I have a uti and severe kidney pain, Is this common?
    I have a uti and such bad kidney pain that I can hardly move, I cant bend down and it hurts more than I can explain. the pain comes and ... More
    Was this Helpful?
    0 of 0 found this helpful

    Report Problems With Your Medications to the FDA

    FDAYou are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.