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Davita GFR Calculator (CKD-EPI 2009)
Enter values and click "Calculate GFR"
Disclaimer: This calculator provides an estimated GFR based on the CKD-EPI 2009 equation. It is for informational purposes only and should not be used as a substitute for professional medical advice. Consult with a healthcare professional for diagnosis and treatment.
function calculateGFR() {
var serumCreatinine = parseFloat(document.getElementById('serumCreatinine').value);
var age = parseFloat(document.getElementById('age').value);
var sexFemale = document.getElementById('sexFemale').checked;
var raceBlack = document.getElementById('raceBlack').checked;
if (isNaN(serumCreatinine) || isNaN(age) || serumCreatinine <= 0 || age <= 0) {
document.getElementById('gfrResult').innerHTML = 'Please enter valid positive numbers for Serum Creatinine and Age.';
return;
}
var kappa, alpha;
var sexFactor = 1;
var raceFactor = 1;
if (sexFemale) {
kappa = 0.7;
alpha = -0.329;
sexFactor = 1.018;
} else { // Male
kappa = 0.9;
alpha = -0.411;
sexFactor = 1; // No specific factor for males in this part of the equation
}
if (raceBlack) {
raceFactor = 1.159;
} else { // Non-Black
raceFactor = 1;
}
var gfr = 141 *
Math.pow(Math.min(serumCreatinine / kappa, 1), alpha) *
Math.pow(Math.max(serumCreatinine / kappa, 1), -1.209) *
Math.pow(0.993, age) *
sexFactor *
raceFactor;
document.getElementById('gfrResult').innerHTML = 'Estimated GFR: ' + gfr.toFixed(2) + ' mL/min/1.73 m²';
}
Understanding Your GFR with the Davita GFR Calculator
The Glomerular Filtration Rate (GFR) is a crucial measure of kidney function. It estimates how much blood passes through the glomeruli (tiny filters in the kidneys) each minute. A healthy GFR indicates that your kidneys are effectively filtering waste products from your blood. Davita, a leading kidney care provider, often refers to GFR calculations based on widely accepted formulas like the CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) equation, which this calculator utilizes.
What is GFR and Why is it Important?
GFR is considered the best overall measure of kidney function. It helps healthcare professionals:
- Detect Kidney Disease: A low GFR can be an early sign of kidney damage or chronic kidney disease (CKD).
- Stage Kidney Disease: CKD is categorized into stages based on GFR levels, which guides treatment and management.
- Monitor Disease Progression: Tracking GFR over time helps assess if kidney function is stable, improving, or worsening.
- Adjust Medication Dosages: Many medications are cleared by the kidneys, and dosages may need adjustment based on GFR to prevent accumulation and toxicity.
How the Davita GFR Calculator (CKD-EPI 2009) Works
This calculator uses the CKD-EPI 2009 equation, which is widely recommended for its accuracy across various populations. It takes into account several key factors:
- Serum Creatinine (mg/dL): Creatinine is a waste product from muscle metabolism. Healthy kidneys filter creatinine efficiently, so higher levels in the blood can indicate reduced kidney function.
- Age (years): Kidney function naturally declines with age, so age is an important factor in estimating GFR.
- Sex: Biological differences between males and females, particularly in muscle mass, affect creatinine levels and are accounted for in the formula.
- Race: The CKD-EPI equation includes a race factor (specifically for Black individuals) to improve accuracy, as creatinine levels can vary between racial groups due to differences in muscle mass and diet.
Interpreting Your GFR Results
GFR is measured in milliliters per minute per 1.73 square meters (mL/min/1.73 m²), which adjusts for body surface area. Here's a general guide to GFR stages:
- GFR 90 or higher: Normal kidney function.
- GFR 60-89: Mildly decreased kidney function. Often, there are no symptoms at this stage.
- GFR 45-59: Mild to moderate decrease in kidney function.
- GFR 30-44: Moderate to severe decrease in kidney function.
- GFR 15-29: Severely decreased kidney function.
- GFR less than 15: Kidney failure, often requiring dialysis or kidney transplant.
It's important to remember that a single GFR reading is just one piece of information. Your doctor will consider your overall health, medical history, and other tests to make a diagnosis.
Realistic Examples
Let's look at a few examples using the Davita GFR Calculator:
Example 1: Healthy Young Adult
- Serum Creatinine: 0.8 mg/dL
- Age: 30 years
- Sex: Female
- Race: Non-Black
- Calculated GFR: Approximately 105 mL/min/1.73 m²
- Interpretation: This GFR is within the normal range, indicating healthy kidney function.
Example 2: Middle-Aged Male with Mildly Elevated Creatinine
- Serum Creatinine: 1.2 mg/dL
- Age: 55 years
- Sex: Male
- Race: Non-Black
- Calculated GFR: Approximately 68 mL/min/1.73 m²
- Interpretation: This GFR falls into the mildly decreased kidney function range (Stage 2 CKD). While still relatively good, it warrants monitoring and discussion with a doctor.
Example 3: Older Black Female with Elevated Creatinine
- Serum Creatinine: 1.8 mg/dL
- Age: 70 years
- Sex: Female
- Race: Black
- Calculated GFR: Approximately 38 mL/min/1.73 m²
- Interpretation: This GFR indicates a moderate to severe decrease in kidney function (Stage 3b CKD). This level typically requires close medical management to slow progression and manage complications.
Important Disclaimer
This Davita GFR calculator is designed to provide an estimate of your GFR based on the CKD-EPI 2009 equation. It is not 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. Your doctor will interpret your GFR results in the context of your complete medical history and other diagnostic tests.