Glomerular Filtration Rate (eGFR) Calculator

What is your Glomerular Filtration Rate.

About eGFR Calculator

What is Glomerular Filtration Rate?

Your estimated glomerular filtration rate (eGFR) helps medical professionals identify whether you have kidney disease and, if so, at what stage. The kidneys' capacity to remove waste or poisons from your blood is gauged by your eGFR. If the number is extremely low, renal failure may be present, necessitating dialysis or a kidney transplant.

Glomeruli are little filters found in your kidneys. These filters aid in clearing the blood of waste and extra fluid. The eGFR test is a straightforward method for estimating GFR, using factors such as age, weight, height, gender, and creatinine levels to provide a reliable estimate.

What is a GFR Calculator?

A GFR calculator uses a formula to estimate the kidneys' filtration rate. By comparing your blood test results (specifically creatinine levels) with personal factors such as age, gender, and body size, it calculates your eGFR.

Cockcroft-Gault Formula: eGFR = [(140 - age) × weight (kg) × constant] ÷ serum creatinine (mg/dL)

MDRD Formula: eGFR = 175 × (serum creatinine)^(-1.154) × (age)^(-0.203) × (0.742 if female)

CKD-EPI Formula: eGFR = 141 × min(SCr/k, 1)^a × max(SCr/k, 1)^b × 0.993^(age) × (1.018 if female)

What is the Difference Between eGFR and mGFR?

eGFR is an estimate of the kidneys' filtration rate, often calculated using formulas like Cockcroft-Gault, MDRD, or CKD-EPI. mGFR, on the other hand, refers to the measured GFR, which is obtained through more direct but complex and time-consuming methods.

eGFR is more commonly used in clinical settings due to its simplicity, while mGFR is used for research or specific diagnostic purposes.

How to Protect Your Kidney Function

Have your kidneys checked at least once a year with an eGFR test.
Control high blood pressure and diabetes if applicable.
Avoid NSAIDs like ibuprofen and naproxen if you have CKD.
Maintain a healthy lifestyle with regular exercise and a balanced diet.
Quit smoking and avoid processed foods.
Consult your healthcare provider before taking supplements or medications that may affect kidney function.

How to Prepare for a Serum Creatinine Test

Follow your doctor's instructions to prepare for the test. You might need to fast or stop certain medications beforehand. Avoid cooked meat the day before the test, as it can temporarily increase creatinine levels.

What is Normal GFR for Age?

eGFR is measured in mL/min/1.73m² and varies with age. For instance:

20s: ~116 mL/min/1.73m²
Over 60: ~85 mL/min/1.73m²

A GFR of 60 or higher is generally considered normal, while lower values may indicate kidney disease.

What Does Glomerular Filtration Rate Indicate?

GFR indicates how well your kidneys are filtering blood. A GFR of:

60 or higher: Normal kidney function.
Less than 60: Possible kidney disease.
15 or less: Kidney failure, requiring immediate medical attention.

Consult a healthcare professional for further evaluation and treatment if your GFR is abnormal.