A calculation used to estimate how well your kidneys are filtering certain agents produced by your body, such as:
Creatinine (a waste product that comes from the normal wear and tear on muscles)
Cystatin C (a protein that slows down the breakdown of other protein cells)
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.
