Items in the Tests section
Glomerular Filtration Rate (GFR)
The Foundation for IgA Nephropathy
Glomerular Filtration Rate (GFR)
This is the rate at which your kidneys filter. Basically, it is what we patients refer to as "kidney function". GFR is estimated using a mathematical formula (of which there are a number, but a common one and one which is increasingly used is the MDRD formula). For example, if a GFR formula or calculator gives you a result of 10 ml/min/1.73 m
2)
, this means you have about 10% kidney function, and it's probably time to start you on dialysis (depending on other factors). GFR can also be estimated by using creatinine clearance from a 24 hour urine collection. A different formula is used for children. See link below to GFR calculators.
Creatinine clearance obtained from a timed urine collection (usually a 24 hour urine collection) is roughly equivalent to GFR. However, because some creatinine ends up in the urine via renal tubular excretion in addition to glomerular clearance, this must be interpreted by your nephrologist. The less GFR you have, the more this error can be pronounced. Creatinine clearance and GFR are therefore only approximately equivalent.
Warning
Estimated GFR may not always be accurate. It should always be interpreted in consultation with your nephrolgist.
|
Note that the calculators may not require weight because the results are reported normalized to 1.732 body surface area, which is an accepted average adult surface area.
|
© 2002-2006 Foundation for IgA Nephropathy
This page last updated: |