Glomerular Filtration Rate
What is GFR?
Glomerular filtration rate (GFR) is also known as the estimated glomerular filtration rate (eGFR). This test is advised to evaluate kidney function. It helps to diagnose stage and monitor chronic kidney disease.
Why is GFR done?
The glomerular filtration rate is done:
As a part of routine tests along with blood creatinine test
In case of signs of kidney damage
In case of the risk of developing kidney disease
What does GFR Measure?
Glomerular Filtration Rate (GFR) helps in measuring the function of kidneys. Glomeruli are present in the kidneys. They are tiny filters that allow waste products to be removed from the blood. They prevent the loss of important constituents including blood cells and proteins.
Normally healthy kidneys filter about 200 quarts of blood and produce approximately 2 quarts of urine. The GFR is the amount of blood which is filtered by the glomeruli per minute. At the time of kidney function damage or disease, there is a decrease in the filtration rate. This results in the piling up of waste products in the blood.
The chronic kidney disease (CKD) is related with a progressive decrease in kidney function. CKD might be seen in conditions such as diabetes and high blood pressure. Early detection of kidney dysfunction can help to minimize further kidney damage. This is important as symptoms of kidney disease are usually noticeable only after there is a loss in 30-40% of kidney function.
Interpreting GFR results
Age in Years
GFR in mL/min/1.73 meter sq.
20 - 29
30 - 39
40 - 49
50 - 59
60 - 69
More than or equal to 70
GFR (mL/min/1.73 msq.)
Normal kidney function
Kidney damage with normal or high GFR
Presence of protein, albumin, cells or casts in urine
Mild decrease in GFR
60 - 89
Moderate decrease in GFR
30 - 59
Severe disease in GFR
15 - 29
Answers to Patient Concerns & Frequently Asked Questions (FAQs) about GFR
Frequently Asked Questions about Glomerular Filtration Rate