Davita Gfr Calculator

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DaVita GFR Calculator

Estimate your kidney function using the CKD-EPI (2021) Creatinine Equation.

Male Female

Your Estimated GFR

function calculateGFR() { var cr = parseFloat(document.getElementById('creatinine').value); var age = parseFloat(document.getElementById('age').value); var sex = document.getElementById('gender').value; var resultBox = document.getElementById('result-box'); var gfrValueDisplay = document.getElementById('gfr-value'); var gfrStageDisplay = document.getElementById('gfr-stage'); var gfrDescDisplay = document.getElementById('gfr-description'); if (isNaN(cr) || isNaN(age) || cr <= 0 || age <= 0) { alert("Please enter valid positive numbers for Creatinine and Age."); return; } var k, a, sex_mod; if (sex === 'female') { k = 0.7; a = -0.241; sex_mod = 1.012; } else { k = 0.9; a = -0.302; sex_mod = 1.0; } // CKD-EPI 2021 Equation var gfr = 142 * Math.pow(Math.min(cr / k, 1), a) * Math.pow(Math.max(cr / k, 1), -1.200) * Math.pow(0.9938, age) * sex_mod; gfr = Math.round(gfr); gfrValueDisplay.innerHTML = gfr + " mL/min/1.73m²"; var stage = ""; var desc = ""; var color = ""; if (gfr >= 90) { stage = "Stage 1"; desc = "Normal kidney function (if other signs of kidney damage are present)."; color = "#28a745"; } else if (gfr >= 60) { stage = "Stage 2"; desc = "Mild decrease in kidney function."; color = "#88c057"; } else if (gfr >= 45) { stage = "Stage 3a"; desc = "Mild to moderate decrease in kidney function."; color = "#ffc107"; } else if (gfr >= 30) { stage = "Stage 3b"; desc = "Moderate to severe decrease in kidney function."; color = "#fd7e14"; } else if (gfr >= 15) { stage = "Stage 4"; desc = "Severe decrease in kidney function. Prepare for potential dialysis or transplant."; color = "#dc3545"; } else { stage = "Stage 5"; desc = "Kidney failure. Requires dialysis or a kidney transplant."; color = "#721c24"; } gfrStageDisplay.innerHTML = stage; gfrStageDisplay.style.color = color; gfrDescDisplay.innerHTML = desc; resultBox.style.display = "block"; resultBox.style.borderColor = color; }

Understanding Your GFR Results

The Glomerular Filtration Rate (GFR) is widely considered the best way to measure how well your kidneys are filtering waste from your blood. A DaVita GFR calculation uses a simple blood test result—your serum creatinine—along with your age and biological sex to estimate the health of your kidneys.

Why Use the 2021 CKD-EPI Formula?

This calculator utilizes the 2021 CKD-EPI Creatinine Equation, which is the current clinical standard recommended by the National Kidney Foundation (NKF) and the American Society of Nephrology (ASN). Unlike older versions, this formula provides an accurate estimation of kidney function without using race as a variable, ensuring more equitable care and diagnosis for all patients.

Chronic Kidney Disease (CKD) Stages

A "normal" GFR for most healthy adults is 90 or higher. As GFR decreases, it indicates a decline in kidney health. Here is how the stages are generally categorized:

  • Stage 1 (GFR 90+): Normal kidney function, but there may be signs of kidney damage like protein in the urine.
  • Stage 2 (GFR 60-89): Mild loss of kidney function.
  • Stage 3 (GFR 30-59): Moderate loss of kidney function. Often split into 3a and 3b.
  • Stage 4 (GFR 15-29): Severe loss of kidney function.
  • Stage 5 (GFR below 15): Kidney failure or near-failure.

Example Calculations

Example 1: A 55-year-old male with a serum creatinine of 1.2 mg/dL would have an estimated GFR of approximately 75 mL/min/1.73m² (Stage 2).

Example 2: A 68-year-old female with a serum creatinine of 1.8 mg/dL would have an estimated GFR of approximately 30 mL/min/1.73m² (Stage 3b/4).

Steps to Improve Kidney Health

If your GFR is lower than expected, it is vital to consult with a healthcare professional or a nephrologist. Common steps to protect your kidneys include:

  1. Manage Blood Pressure: Keep blood pressure within the target range recommended by your doctor.
  2. Control Blood Sugar: If you have diabetes, managing glucose levels is the most important factor in preventing kidney damage.
  3. Dietary Changes: Reducing sodium (salt) and monitoring protein intake can reduce the workload on the kidneys.
  4. Stay Hydrated: Drinking enough water helps the kidneys clear sodium and toxins from the blood.

Disclaimer: This calculator is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult with your doctor regarding your kidney health and lab results.

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