Cardiovascular Disease - Bloody Good
Kidney Health

Estimated Glomerular Filtration Rate (eGFR)

Get the most accurate assessment of your kidney function with our eGFR test. This sophisticated calculation provides precise measurement of how well your kidneys are filtering blood, essential for detecting kidney disease stages and guiding treatment decisions.

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Estimated Glomerular Filtration Rate (eGFR)

Want the most precise assessment of how well your kidneys are filtering waste, or need accurate staging of kidney function for optimal health monitoring?

Overview

Your kidneys work like your body's master filtration system, constantly cleaning waste and excess fluid from your blood around the clock. The eGFR (estimated Glomerular Filtration Rate) test acts as a sophisticated performance check for these vital organs, measuring how efficiently your kidneys can filter blood by calculating how much they process per minute. Unlike basic kidney tests that only look at waste levels in your blood, eGFR creates a personalized assessment by factoring in your age, gender, and other individual characteristics to give you a complete picture of how well your filtration system is actually working.

This test is particularly valuable because it can detect kidney problems early, often before you feel any symptoms, and helps stage kidney disease from mild to severe. Whether you have diabetes, high blood pressure, take certain medications, or have a family history of kidney issues, eGFR testing provides crucial insights that help your healthcare provider protect your kidney health and adjust treatments as needed. Think of it as your kidney report card – giving you and your doctor the information needed to keep these essential organs functioning at their best for years to come.

Reviewed by Dr. Vu Tran
Bloody Good’s Chief Medical Officer

Symptoms

You may benefit from this test if you experience:
High blood pressure readings Flank pain or back pain related to kidneys Swelling around eyes or face

Purpose

Essential for anyone with diabetes, high blood pressure, or family history of kidney disease. Critical for medication dosing and monitoring chronic kidney disease progression. Valuable for comprehensive health assessment and cardiovascular risk evaluation, as kidney function closely relates to heart health.

How to prepare

No fasting required. Can be taken at any time of day. Ensure accurate reporting of age, gender, and race as these factors are used in the calculation. Inform your healthcare provider about medications that might affect kidney function. Stay normally hydrated before testing.

Understanding results

Normal ranges by age: 18-29 years: >116 mL/min/1.73m²; 30-39 years: >107 mL/min/1.73m²; 40-49 years: >99 mL/min/1.73m²; 50-59 years: >93 mL/min/1.73m²; 60-69 years: >85 mL/min/1.73m²; 70+ years: >75 mL/min/1.73m². CKD stages: Stage 1: ≥90; Stage 2: 60-89; Stage 3a: 45-59; Stage 3b: 30-44; Stage 4: 15-29; Stage 5: <15 mL/min/1.73m².

After the test

If eGFR shows reduced kidney function, discuss with your healthcare provider about further evaluation and kidney protection strategies. May require referral to nephrologist, additional testing (urine protein, kidney imaging), blood pressure optimization, diabetes management, medication adjustments, and lifestyle modifications. Regular monitoring helps track progression and guide treatment.

Frequently Asked Questions

  • Creatinine is the raw measurement, while eGFR is a calculated result that adjusts for age, gender, race, and body size, providing a more accurate assessment of actual kidney function.
  • Kidney function naturally decreases by about 1% per year after age 30 due to normal aging processes, which is why age-adjusted reference ranges are used for interpretation.
  • While you can't reverse kidney damage, eGFR decline can often be slowed or stabilized through blood pressure control, diabetes management, lifestyle changes, and proper medication management.
  • For people with kidney disease or risk factors, eGFR should be checked every 3-6 months. For healthy individuals, annual screening is often sufficient, but may be more frequent for those over 50.
  • Stage 1-2: Normal/mildly reduced function; Stage 3: Moderately reduced (may need specialist care); Stage 4: Severely reduced (prepare for kidney replacement therapy); Stage 5: Kidney failure (need dialysis or transplant).
  • Yes, certain medications can temporarily or permanently affect kidney function. Always inform your doctor about all medications, and some may need dose adjustments based on eGFR levels.
Estimated Glomerular Filtration Rate (eGFR)

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