Q: My eGFR is below 60. What should I do?

An eGFR below 60 warrants medical attention but shouldn't cause panic. Steps to take: (1) Confirm the result - a single test isn't diagnostic; your doctor will likely repeat it; (2) Get evaluated for underlying causes - diabetes, hypertension, and other conditions can cause kidney damage; (3) Have additional tests - urinalysis, kidney ultrasound, and possibly other blood tests; (4) Review your medications - some can affect kidney function; (5) Make lifestyle changes - reduce salt intake, manage blood pressure, stay hydrated, avoid NSAIDs. Early intervention can significantly slow CKD progression.

Q: How is eGFR different in elderly patients?

In elderly patients (>70 years): (1) Kidney function naturally declines with age - some reduction is expected; (2) Muscle mass is typically lower, potentially causing falsely 'normal' creatinine despite reduced function; (3) Cystatin C-based equations may be more accurate; (4) CKD diagnosis requires careful interpretation - a 75-year-old with eGFR of 55 may have age-appropriate function; (5) Frailty and overall health status matter more than eGFR alone; (6) Treatment decisions should consider life expectancy and quality of life, not just numbers.

Question 1

What is eGFR and why is it important?

Accepted Answer

eGFR (estimated Glomerular Filtration Rate) measures how well your kidneys filter waste from your blood. It's expressed in mL/min/1.73m² and represents the volume of blood filtered per minute, adjusted for body surface area. A normal eGFR is typically 90 mL/min/1.73m² or higher. This measurement is the gold standard for assessing kidney function and is essential for detecting chronic kidney disease (CKD), monitoring disease progression, adjusting medication dosages, and planning treatment strategies.

Question 2

What is the difference between GFR and eGFR?

Accepted Answer

GFR (Glomerular Filtration Rate) is the actual rate at which your kidneys filter blood, which can only be measured directly through complex procedures involving injected tracers and multiple blood/urine samples over several hours. eGFR (estimated GFR) is a calculated approximation based on serum creatinine (and sometimes cystatin C), age, and sex. While eGFR is not as precise as measured GFR, it's much more practical for routine clinical use and provides sufficiently accurate results for most patients.

Question 3

What factors affect eGFR calculations?

Accepted Answer

Several factors can influence eGFR results: (1) Muscle mass - people with more muscle produce more creatinine, potentially underestimating their true GFR; (2) Diet - high protein intake or creatine supplements can raise creatinine levels; (3) Medications - some drugs like trimethoprim can interfere with creatinine secretion; (4) Hydration status - dehydration can concentrate creatinine; (5) Recent intense exercise - can temporarily elevate creatinine; (6) Age - kidney function naturally declines with age; (7) Acute kidney injury - eGFR is designed for stable kidney function and may be inaccurate during acute changes.

Question 4

What are the stages of Chronic Kidney Disease (CKD)?

Accepted Answer

CKD is classified into 5 stages based on eGFR: Stage G1 (eGFR ≥90): Normal kidney function with other signs of kidney damage; Stage G2 (eGFR 60-89): Mildly reduced function; Stage G3a (eGFR 45-59): Mild to moderate reduction; Stage G3b (eGFR 30-44): Moderate to severe reduction; Stage G4 (eGFR 15-29): Severely reduced function; Stage G5 (eGFR <15): Kidney failure. Staging also considers albuminuria (protein in urine) levels: A1 (<30 mg/g), A2 (30-300 mg/g), A3 (>300 mg/g).

Question 5

What does it mean if my eGFR is between 60-89?

Accepted Answer

An eGFR of 60-89 (Stage G2) indicates mildly reduced kidney function. This is common, especially in older adults, and doesn't necessarily mean you have CKD. CKD diagnosis requires either: (1) eGFR <60 for at least 3 months, OR (2) eGFR 60-89 WITH evidence of kidney damage (abnormal urine tests, structural abnormalities, history of kidney transplant). Many people with eGFR in this range have normal aging kidneys. However, if you have diabetes, hypertension, or other risk factors, monitoring is important.

Question 6

My eGFR is below 60. What should I do?

Accepted Answer

An eGFR below 60 warrants medical attention but shouldn't cause panic. Steps to take: (1) Confirm the result - a single test isn't diagnostic; your doctor will likely repeat it; (2) Get evaluated for underlying causes - diabetes, hypertension, and other conditions can cause kidney damage; (3) Have additional tests - urinalysis, kidney ultrasound, and possibly other blood tests; (4) Review your medications - some can affect kidney function; (5) Make lifestyle changes - reduce salt intake, manage blood pressure, stay hydrated, avoid NSAIDs. Early intervention can significantly slow CKD progression.

Question 7

How is eGFR different in elderly patients?

Accepted Answer

In elderly patients (>70 years): (1) Kidney function naturally declines with age - some reduction is expected; (2) Muscle mass is typically lower, potentially causing falsely 'normal' creatinine despite reduced function; (3) Cystatin C-based equations may be more accurate; (4) CKD diagnosis requires careful interpretation - a 75-year-old with eGFR of 55 may have age-appropriate function; (5) Frailty and overall health status matter more than eGFR alone; (6) Treatment decisions should consider life expectancy and quality of life, not just numbers.

Question 8

Is eGFR accurate in pregnant women?

Accepted Answer

Standard eGFR equations are NOT validated for pregnancy. During pregnancy: (1) Blood volume increases significantly, diluting creatinine; (2) GFR actually increases by 50% in normal pregnancy; (3) Normal pregnant creatinine levels are lower (0.4-0.8 mg/dL); (4) 'Normal' non-pregnant creatinine might indicate kidney problems in pregnancy. Pregnant women with suspected kidney issues need specialized evaluation. If you have CKD and are pregnant or planning pregnancy, close monitoring by both a nephrologist and obstetrician is essential.

Question 9

How accurate is this free online eGFR calculator?

Accepted Answer

Our calculator uses the same validated CKD-EPI 2021 equations used by healthcare professionals worldwide. The mathematical calculations are highly accurate. However, remember: (1) Results are estimates, not measured values; (2) Accuracy depends on the accuracy of your input values; (3) Certain populations (extremes of body size, muscle mass, etc.) may have less accurate estimates; (4) A single result shouldn't be used for diagnosis - clinical context matters. Our calculator is an excellent tool for monitoring and understanding your results, complementing (not replacing) professional medical care.

Question 10

Can I use this calculator for medical decisions?

Accepted Answer

This calculator is for educational and informational purposes only. While it uses validated medical equations, it should NOT be used to: (1) Self-diagnose kidney disease; (2) Adjust medications without doctor guidance; (3) Replace professional medical evaluation; (4) Make treatment decisions independently. Always discuss your results with a healthcare provider who can consider your complete medical picture. The calculator is a tool to help you understand and track your kidney function in partnership with your medical team.

Question 11

Is my data saved or shared?

Accepted Answer

No! Your privacy is paramount: (1) All calculations happen locally in your browser; (2) No health data is transmitted to our servers; (3) No registration or personal information is required; (4) We don't use cookies to track your health information; (5) The optional history feature stores data only in your browser's local storage, which you can clear anytime. See our Privacy Policy for complete details. Use our calculator with confidence that your medical information remains private.

eGFR Calculator FAQ and Kidney Function Help

eGFR Basics and Kidney Function Test Meaning

CKD Stages Explained and eGFR Result Interpretation

eGFR Questions for Special Populations

How to Use the eGFR Calculator Correctly

Quick Tips for Reading eGFR Results

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Track Over Time

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