Glomerular filtration rate (GFR) is a test used to check how well the kidneys are working. Specifically, it estimates how much blood passes through the tiny filters in the kidneys, called glomeruli, each minute.
According to the National Kidney Foundation, normal results range from 90 - 120 mL/min/1.73 m2.
The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different sample. Levels below 60 mL/min/1.73 m2 for 3 or more months are a sign of chronic kidney disease. A GFR result below 15 mL/min/1.73 m2 is a sign of kidney failure and requires immediate medical attention.
in most cases, a result of >60 mL/min/1.73 m2 is considered normal.
Here is a website that provides a detailed explanation of the equations used to determine filtration rates:
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