In addition to GFR, you should have a simple urine test called ACR. Will I need other tests besides GFR to check for kidney disease? Cystatin C-based estimates for GFR are believed to be less influenced by muscle mass or diet than creatinine-based estimates. You are overweight, elderly or have lots of muscle (such as a body builder).
In this instance, your healthcare provider may give you cystatin C test to confirm whether or not you have kidney disease. A previous test for kidney function was inconclusive or needs to be confirmed.When is cystatin C used to estimate GFR?Ī cystatin C blood test can be helpful if: But it can be very helpful in some instances. The cystatin C test is not the usual or regular way that your healthcare provider will estimate your GFR. Like creatinine, the cystatin C number is used in a math formula with your age, race, and gender to estimate your GFR. The level of creatinine in your blood and your age, race, and gender are used in a math formula to estimate your GFR.Īnother way to estimate GFR is with a simple blood test for cystatin C. Your kidneys usually keep the level of creatinine just right. Creatinine is a waste product made by your body's muscles. Having a simple blood test for creatinine is the first step in checking your GFR. If your GFR number is low, your kidneys may not be working as well as they should. They filter our waste and extra water from your body, help make red blood cells, and keep your bones strong. Your GFR tells a lot about how well your kidneys are working. What is GFR (glomerular filtration rate)? Your GFR number helps your healthcare provider know how well your kidneys are working. If the level of cystatin C in your blood is too high, it may mean that your kidneys are not working well.Ī blood test for cystatin C can help your healthcare provider find your GFR (glomerular filtration rate). When kidneys are working well, they keep the level of cystatin C in your blood just right. Cystatin C is a protein that is produced by the cells in your body.
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