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About estimated glomerular rate (eGFR)Your kidneys filter your blood by removing waste and extra water to make urine. The glomerular filtration rate (GFR) shows how well the kidneys are filtering. An estimated 37 million adults in the United States may have chronic kidney disease (CKD) but nearly 90% are unaware of their condition. When found early, people can take important steps to protect their kidneys. Types Measuring and estimating GFRGetting an accurate GFR level is challenging because measured GFR (mGFR) is a complicated and lengthy process. This makes it impractical for both clinicians and patients. It is for this reason that healthcare professionals use a formula to estimate GFR. Often, CKD does not have any symptoms until the later stages of the disease. This is the reason why reliable estimates of GFR are so important for identifying CKD as early as possible. The standard way to estimate GFR is with a simple blood test that measures your creatinine levels. Creatinine is a waste product that comes from the digestion of dietary protein and the normal breakdown of muscle tissue. Aside from CKD, creatinine levels can be affected by other factors including diet; muscle(weight of your muscles); malnutrition; and other chronic illnesses. Differences between eGFR and mGFR
*Other factors that can affect eGFR include: pregnancy, being over the age of 70, unusual muscle mass, cirrhosis (a disease caused by scarring in the liver), nephrotic syndrome (a condition caused by having too much protein in your urine), a past solid organ transplant, and some medications. Purpose Why eGFR testing is doneEarly-stage CKD doesn’t usually cause symptoms, but your doctor may recommend an eGFR test if you are at higher risk of developing the disease. CKD risk factors include: Family history of CKD or kidney failure Usually, developing CKD is not due to any single reason, but because of a combination of physical, environmental, and social factors. Later stage CKD does cause symptoms. So you may need an eGFR test if you have any of the following symptoms:
Risks There is very little risk to having a blood test. You may have slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly. Before the testAsk your health care professional if there are any special instructions to follow. You may need to avoid eating or drinking anything (except water) for several hours before the test. You may also be asked not to eat any cooked meat the night before the test. It can increase the level of creatinine in your blood and affect your eGFR results. During the testA health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes. After the testThere are typically no restrictions after blood is drawn for the test. Results
What is a normal eGFR number?In adults, the normal eGFR number is usually more than 90. eGFR declines with age, even in people without kidney disease. See chart below for average estimated eGFR based on age.
Understanding your resultsThere are five stages of kidney disease. Your healthcare professional determines your stage of kidney disease based on the amount of kidney damage shown by your eGFR or mGFR. Now that your know your eGFR, find out your kidney disease stage using the table below. What are the stages of chronic kidney disease (CKD)?
What to do nextIf you have any of the CKD risk factors listed above, ask your healthcare professional to order an eGFR lab test. Questions for your healthcare teamNow that you know your eGFR and your stage of kidney disease, use this table to find questions to ask your healthcare professional at your appointments.
Downloadable PDFKidney Numbers and the CKD Heat MapDownload a printable resource that explains what kidney numbers are and how your healthcare professional uses them to diagnose CKD. This content is provided for informational use only and is not intended as medical advice or as a substitute for the medical advice of a healthcare professional. Last Reviewed: 09/23/2021 Wie hoch darf der GFR CKD Epi wert sein?eGFR – nach CKD-EPI-Formel. Was sagt der GFR CKD Epi Wert aus?Die glomeruläre Filtrationsrate (GFR) ist die wichtigste Größe zur Abschätzung der Nierenfunktion. Eine GFR von 26 ml/min sagt z.B. aus, dass die Funktion Ihrer Nieren bei rund 26 % der normalen Leistung liegt. Die Funktion Ihrer Nieren wird daran gemessen, wie gut sie das Blut reinigen.
Wann ist der GFR Wert bedenklich?GFR: Bei jungen nierengesunden Menschen 90–130 ml/min. Ab 60 ml/min spricht man von einer chronischen Nierenschwäche, unterhalb von etwa 10 bis 15 ml/min wird meist in absehbarer Zeit eine Dialyse (Blutwäsche) nötig.
Wie hoch sollte der GFR wert sein?Die normale GFR liegt bei ca. 90 - 120 ml/min und nimmt im Durchschnitt ab dem 40. Lebensjahr um ca. 1 ml/min pro Jahr altersbedingt ab.
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