Creatinine clearance is a measure of how well your kidneys are functioning. It estimates the rate at which creatinine, a waste product from muscle metabolism, is filtered from your blood by your kidneys. A higher creatinine clearance rate generally indicates better kidney function, while a lower rate may suggest impaired kidney function.
The Cockcroft-Gault formula is a commonly used equation to estimate creatinine clearance. It takes into account a person's weight, age, and gender, along with their serum creatinine level. The formula is as follows:
For Males: Creatinine Clearance (mL/min) = [(140 – Age) x Weight (kg)] / [72 x Serum Creatinine (mg/dL)]
For Females: Creatinine Clearance (mL/min) = [(140 – Age) x Weight (kg) x 0.85] / [72 x Serum Creatinine (mg/dL)]
It's important to note that this is an estimation. Other factors can influence kidney function, and a healthcare professional should interpret these results in the context of your overall health. This calculator is for informational purposes only and should not replace professional medical advice.
How to Use This Calculator:
Enter your current Weight in kilograms.
Enter your Age in years.
Enter your most recent Serum Creatinine level in milligrams per deciliter (mg/dL).
Select your Gender.
Click the "Calculate Creatinine Clearance" button.
function calculateCreatinineClearance() {
var weight = parseFloat(document.getElementById("weight").value);
var age = parseInt(document.getElementById("age").value);
var serumCreatinine = parseFloat(document.getElementById("serumCreatinine").value);
var gender = document.getElementById("gender").value;
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous result
if (isNaN(weight) || isNaN(age) || isNaN(serumCreatinine) || weight <= 0 || age <= 0 || serumCreatinine <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for all fields.";
return;
}
var creatinineClearance;
var weightFactor = (gender === "male") ? 1 : 0.85;
// Cockcroft-Gault Formula
creatinineClearance = ((140 – age) * weight * weightFactor) / (72 * serumCreatinine);
// Ensure the result is not negative, which can happen with very high creatinine or very low weight/age
if (creatinineClearance < 0) {
creatinineClearance = 0;
}
resultDiv.innerHTML = "Your estimated Creatinine Clearance is: " + creatinineClearance.toFixed(2) + " mL/min";
}
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