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There is a natural loss of kidney function that occurs with aging.  You cannot stop the aging process.  Beyond age 40 one loses about 1 milliliter per minute per year (about 1% per year) per 1.73 meters squared from your estimated glomerular filtration rate (eGFR).  You should monitor you kidney function annually and can anticipate some loss over time, but you currently have sufficient kidney function to last you quite some time if you care for...
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You may have mild Stage 3 chronic kidney disease, but this test needs to be repeated. To qualify as chronic kidney disease (CKD), you must have an estimated glomerular filtration rate (eGFR) of less than 60 milliliters per minute per 1.73 meters squared for greater than 3 months.
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There are different estimating equations for Caucasians and African American individuals. The laboratory that runs the blood test does not know if you are a Caucasian or an African American and so it provides the estimated glomerular filtration rate (eGFR) for both Caucasians and African American individuals. You have to choose the result appropriate for you.
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An estimate glomerular filtration rate (eGFR) of greater than 60 milliliters per minute per 1.73 meters squared is normal. You can learn more about the eGFR and staging of chronic kidney disease at our web site. You can access this information at: http://www.kidney.org/professionals/kdoqi/gfr.cfm
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A patient with an estimated glomerular filtration rate (eGFR) of 44 milliliters per minute per 1.73 meters squared should not be a kidney donor.  The eGFR measures function for both kidneys.  If you have only one kidney, the eGFR measures the kidney function for that kidney.  Hence, if you have an eGFR of 88, and one kidney is removed, your remaining kidney function would likely be around 44.
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The decision to start dialysis does not rely on a specific number. The decision to start dialysis must be made by the patient in consultation with his or her nephrologist. It is commonly based on symptoms and whether dialysis can effectively treat those symptoms. If the patient has acute kidney disease, the function may improve with time as the cause of the acute kidney injury is resolved. If this is chronic kidney disease (CKD), there may be...
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The normal estimated glomerular filtration rate (eGFR) for someone with a single kidney should be in the range of 50 to 60 milliliters per minute per 1.73 meters squared. Your eGFR is mildly low. You should have this repeated.
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These two numbers (56 & 66) are within the typical laboratory error and may not be different than each other.  I do not know all of your risk factors for contrast so your physician would be the best person to discuss pre-hydration.  Only you physician knows your complete medical history and can perform a complete physical examination so as to assess your risk for contrast.
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A: The MDRD stands for the Modified Diet in Renal Disease equation to estimate eGFR that was derived for participants in the clinical study of diet in kidney disease, published in the 1990s. It has since been validated in other clinical studies, but we have known for some time that it was based on a standard measurement of serum creatinine that was maintained at the laboratory for the Cleveland Clinic. Not every laboratory in the country could...
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I commonly use the drug lisinopril to help preserve kidney function in patients with chronic kidney disease (CKD).
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