CKD Stage Calculator
Understanding Chronic Kidney Disease (CKD) and eGFR
Chronic Kidney Disease (CKD) is a progressive condition characterized by a gradual loss of kidney function over time. Your kidneys play a vital role in filtering waste products and excess fluids from your blood, which are then excreted in your urine. When kidney function declines, waste can build up in your body, leading to serious health problems.
What is eGFR?
The estimated Glomerular Filtration Rate (eGFR) is the best overall measure of kidney function. It indicates how well your kidneys are filtering blood. A higher eGFR generally means better kidney function. The eGFR is calculated using a formula that takes into account your serum creatinine level (a waste product in the blood), age, and sex. This calculator uses the CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) 2021 equation, which is widely accepted and does not include a race coefficient.
CKD Stages Based on eGFR
CKD is categorized into five stages based on the eGFR value. These stages help healthcare providers determine the severity of kidney damage and plan appropriate management strategies:
- Stage G1: eGFR ≥ 90 mL/min/1.73 m² (Normal or high GFR, but with other evidence of kidney damage)
- Stage G2: eGFR 60-89 mL/min/1.73 m² (Mildly decreased GFR, with other evidence of kidney damage)
- Stage G3a: eGFR 45-59 mL/min/1.73 m² (Mild-to-moderately decreased GFR)
- Stage G3b: eGFR 30-44 mL/min/1.73 m² (Moderately-to-severely decreased GFR)
- Stage G4: eGFR 15-29 mL/min/1.73 m² (Severely decreased GFR)
- Stage G5: eGFR < 15 mL/min/1.73 m² (Kidney failure, often requiring dialysis or kidney transplant)
It's important to note that Stages G1 and G2 are only considered CKD if there is also other evidence of kidney damage, such as proteinuria (protein in the urine) or structural abnormalities. Without such evidence, an eGFR in the G1 or G2 range might be considered normal for some individuals.
How to Use This Calculator
To use the CKD Stage Calculator, simply enter your serum creatinine level (from a blood test), your age, and select your sex. The calculator will then provide your estimated GFR and the corresponding CKD stage.
Example Calculation:
Let's consider an example:
- Serum Creatinine: 1.2 mg/dL
- Age: 60 years
- Sex: Male
Using the CKD-EPI 2021 formula, the calculated eGFR would be approximately 68.7 mL/min/1.73 m². Based on this eGFR, the individual would be classified as having CKD Stage G2.
Another example:
- Serum Creatinine: 0.6 mg/dL
- Age: 45 years
- Sex: Female
For this individual, the eGFR would be approximately 112.5 mL/min/1.73 m², placing them in CKD Stage G1.
Disclaimer: This calculator provides an estimated GFR and CKD stage based on the provided inputs and the CKD-EPI 2021 equation. It is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider for any health concerns or before making any decisions related to your health or treatment.