Understanding GFR
Your Glomerular Filtration Rate (GFR) tells your doctor how efficiently your kidneys are working. Kidneys filter waste products, excess fluid, and electrolytes from your blood. The filtering units in your kidneys are called glomeruli. GFR is an estimate of the volume of fluid that is filtered by the glomeruli per unit of time.
Common GFR Formulas:
- CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) Formula: This is the most widely used formula today, considered more accurate than older methods, especially for individuals with normal or mildly reduced kidney function. It takes into account serum creatinine, age, sex, and race.
- MDRD (Modification of Diet in Renal Disease) Study Formula: An older formula that was popular for estimating GFR. It also uses serum creatinine, age, sex, and race.
Interpreting Your GFR:
GFR is usually reported in milliliters per minute per 1.73 square meters (mL/min/1.73 m²). A normal GFR varies with age but is typically above 90 mL/min/1.73 m². Lower GFR values indicate reduced kidney function.
- GFR ≥ 90: Normal kidney function.
- GFR 60-89: Mildly reduced kidney function.
- GFR 30-59: Moderately reduced kidney function.
- GFR 15-29: Severely reduced kidney function.
- GFR < 15: Kidney failure.
Disclaimer: This calculator provides an estimation. Medical decisions should only be made in consultation with a qualified healthcare professional.
function calculateGFR() {
var serumCreatinine = parseFloat(document.getElementById("serumCreatinine").value);
var age = parseInt(document.getElementById("age").value);
var gender = document.getElementById("gender").value;
var race = document.getElementById("race").value;
var gfrResultElement = document.getElementById("gfrResult");
if (isNaN(serumCreatinine) || isNaN(age) || serumCreatinine <= 0 || age = 90) {
interpretation = "Normal kidney function.";
} else if (gfr >= 60 && gfr = 30 && gfr = 15 && gfr < 30) {
interpretation = "Severely reduced kidney function.";
} else if (gfr < 15) {
interpretation = "Kidney failure.";
}
gfrResultElement.innerHTML = "Your estimated GFR is:
" + gfr + " mL/min/1.73 m²." + interpretation;
}
.gfr-calculator-wrapper {
font-family: sans-serif;
display: flex;
flex-wrap: wrap;
gap: 20px;
max-width: 900px;
margin: 20px auto;
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border-radius: 8px;
overflow: hidden;
box-shadow: 0 2px 5px rgba(0,0,0,0.1);
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font-size: 1rem;
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.gfr-calculator-form button:hover {
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/* Responsive adjustments */
@media (max-width: 768px) {
.gfr-calculator-wrapper {
flex-direction: column;
}
.gfr-calculator-form, .gfr-calculator-info {
padding: 20px;
}
}