Your lean body weight is approximately: Height cm — , and also equal to the expected serum creatinine if you are female and have normal kidney function. If your actual weight is less than the values calculated for the lean body weight, you should use this weight.
MDRD modification of diet in renal disease. Click here to calculate your Glomerular Filtration Rate. Your GFR will naturally decrease by 0.
Trends in the GFR provide us with an overview of how the kidneys are functioning. A decrease or decline in the GFR implies progression of underlying kidney disease or the occurrence of a superimposed insult to the kidneys. This is most commonly due to problems such as dehydration and volume loss. An improvement in the GFR may indicate that the kidneys are recovering some of their function.
Whereas we might deduce that a stable GFR implies stable disease, this is not always the case. There is not a directly proportional relationship between the loss of kidney function and loss of kidney mass. With a reduction in the GFR, the elimination of waste products such as urea and creatinine is impaired. Failure to adjust doses of drugs that are excreted by the kidneys such as aminoglycoside antibiotics and heparins may lead to toxic levels of these drugs accumulating.
If you are found to have a decreased GFR level, the doctor may ask you some more questions, perform a clinical examination and certain investigations to work out the underlying cause of your abnormal result. If there are any abnormalities in blood tests or results of other investigations, you may be referred to a kidney specialist called a nephrologist.
You may have heard about a value called the eGFR, which stands for estimated glomerular filtration rate. As the name suggests, this is an estimated value of the GFR, based on an individualised formula. When the doctor requests certain blood tests to investigate your kidney function, the eGFR is also now routinely provided.
The eGFR is calculated based on your age, sex, level of creatinine and your race. This formula does not require any body measurements, thus can be easily calculated in the laboratory. However, there may be falsely high eGFRs for patients with very low body muscle mass, or falsely low eGFRs if you have a large muscle mass.
Your creatinine levels are used in the calculation — in situations where the level is not steady eg acute kidney failure or muscle breakdown , the eGFR will also be less accurate. Password Show. Or create a new account it's free. Forgot Password? Sign In Required. To save favorites, you must log in. Creating an account is free, easy, and takes about 60 seconds.
Log In Create Account. The principal investigators of the study request that you use the official version of the modified score here. Estimates glomerular filtration rate based on creatinine and patient characteristics.
For the same creatinine value, this calculator estimates a higher GFR for Black patients. When to Use. Why Use. Patients with chronic kidney disease, to estimate kidney function.
They are written by UK doctors and based on research evidence, UK and European Guidelines, so you may find the language more technical than the condition leaflets.
There are several equations available for estimating GFR. The calculator is based on the equation described in Levey AS, Bosch JP, Lewis JB, et al; A more accurate method to estimate glomerular filtration rate from serum creatinine: a new prediction equation.
Ann Intern Med. Use the eGFR value calculated by your local laboratory in preference to the above as it is likely to be more accurate as it may adjust for variations in creatinine measurements. Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions.
Your exact GFR cannot be measured directly. Instead, our GFR calculator will give you an estimate using a mathematical formula that most closely determines your kidney function based on certain personal factors and your serum creatinine—which is the amount of creatinine in your blood.
Your estimated glomerular filtration rate eGFR is the calculation that indicates your level of kidney function, based on the results of a creatinine serum test and other factors—such as age, gender, muscle mass, and ethnicity. If your eGFR is below 90, your kidneys may not be functioning as well as they should and you may be at risk for kidney disease. Knowing your eGFR is also important to managing your health at every stage of kidney disease. Kidney damage with mild to moderate loss of kidney function.
Any content provided through our website is informational only and should not be considered medical or professional advice. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have regarding a medical condition. Any information provided on this page is strictly voluntary and subject to our Website Privacy Policy and Terms of Use. Estimating GFR begins with a simple serum creatinine blood test.
Your eGFR helps identify your level of kidney function.
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