The GFR (glomerular filtration rate) Calculator estimates GFR values based on factors including serum creatinine value, age, race, and gender. For comparison purposes, the results for three prevalent formulas used for estimating GFR are provided.

Glomerular Filtration Rate (GFR)

Glomerular filtration rate (GFR) is a measure of how well your kidneys are filtering waste from your blood. GFR is measured in milliliters per minute per 1.73 square meters (mL/min/1.73 m2). A normal GFR is 90 to 120 mL/min/1.73 m2 for adults under the age of 40. GFR tends to decrease with age.

Why is GFR important?

GFR is important because it is a good indicator of how well your kidneys are functioning. If your GFR is low, it means that your kidneys are not filtering waste from your blood as well as they should. This can lead to a buildup of waste in your blood, which can be harmful to your health.

What are the symptoms of low GFR?

In the early stages of kidney disease, you may not have any symptoms. However, as your GFR decreases, you may develop symptoms such as:

• Fatigue

• Weakness

• Shortness of breath

• Swelling in your feet and ankles

• High blood pressure

• Dark-colored urine

• Decreased urine output

How is GFR measured?

GFR can be measured using a blood test or a urine test. The most common blood test used to measure GFR is a creatinine test. Creatinine is a waste product that is produced by your muscles. Your kidneys filter creatinine from your blood. The higher your creatinine level, the lower your GFR.