eGFR (Estimated Glomerular Filtration Rate): Normal Range, R
Everything you need to know about eGFR (Estimated Glomerular Filtration Rate): Normal Range, R test results, including normal ranges and what abnormal levels might mean.
Reference Range
Unit: mL/min/1.73m²Reference Range
Reference ranges vary by laboratory. Always consult your healthcare provider for interpretation of your specific results.
What is eGFR?
eGFR (Estimated Glomerular Filtration Rate) is like a report card for your kidneys. It estimates how well your kidneys are filtering waste and excess fluid from your blood. Your kidneys contain about a million tiny filters called glomeruli, and eGFR calculates how much blood these filters clean each minute.
The calculation uses your creatinine level along with your age, sex, and body size. Because creatinine production varies between people (muscular people produce more, elderly people produce less), these adjustments make eGFR more accurate than creatinine alone.
Think of eGFR as a percentage of normal kidney function. An eGFR of 90 means your kidneys are filtering at 90% of normal. An eGFR of 30 means only 30% filtering capacity remains. When eGFR drops below 15, kidney function is so poor that dialysis or transplant may be needed to sustain life.
The CKD Staging System
eGFR below 60 for 3+ months indicates chronic kidney disease (CKD). Stages: Stage 1 (eGFR ≥90 with kidney damage), Stage 2 (60-89), Stage 3a (45-59), Stage 3b (30-44), Stage 4 (15-29), Stage 5 (＜15, kidney failure). This staging guides monitoring and treatment intensity.
Understanding Your Results
eGFR is measured in milliliters per minute per 1.73 square meters body surface area (mL/min/1.73m²):
Understanding Your Results (mL/min/1.73m²)
Normal kidney filtration—healthy function
Mild decrease—may indicate early CKD if other damage present
Early CKD—medical monitoring important
Moderate CKD—nephrology evaluation recommended
Severe CKD—preparing for kidney failure
Kidney failure—dialysis or transplant evaluation
Why eGFR Changes
eGFR decline reflects reduced kidney filtration capacity:
Causes of Decreased eGFR
| Factor | Effect | What to Do |
|---|---|---|
| Diabetes (most common cause) | Decreases | High blood sugar damages kidney filters over time. Tight blood sugar control significantly slows CKD progression. ACE inhibitors or ARBs protect kidneys in diabetics. Monitor microalbuminuria as early marker. Prevent or delay CKD through diabetes management. |
| High blood pressure (hypertension) | Decreases | Uncontrolled hypertension damages kidney blood vessels and filters. Blood pressure control (typically <130/80 for CKD) is essential. ACE inhibitors or ARBs are first-line—they lower blood pressure and directly protect kidneys. |
| Glomerular diseases (glomerulonephritis) | Decreases | Inflammatory conditions attacking kidney filters. Causes vary—autoimmune, infections, vasculitis. Diagnosis requires kidney biopsy. Treatment: immunosuppressants for autoimmune forms, treat underlying infections. Some forms are reversible if treated early. |
| Polycystic kidney disease (PKD) | Decreases | Inherited condition causing cysts in kidneys. Progressive decline over decades. Control blood pressure, avoid nephrotoxins, monitor for complications. Family screening recommended. Dialysis or transplant typically needed by middle age. |
Always tell your doctor about medications, supplements, and recent health events before testing.
The Chronic vs. Acute Distinction
Distinguishing chronic kidney disease from acute injury is crucial:
When eGFR Patterns Guide Management
Specific eGFR patterns combined with clinical context determine the approach:
eGFR Patterns and Their Meaning
eGFR must be interpreted over time and with clinical context.
eGFR 45-59 stable for 3+ months with protein in urine
Stage 3a CKD. Moderate reduction in kidney function. Nephrology evaluation recommended. Comprehensive management: blood pressure control, diabetes management, cardiovascular risk reduction, monitor for progression. Many people live years with stable stage 3 CKD.
eGFR decline >30% within 48-72 hours
Acute kidney injury (AKI). Medical emergency requiring rapid evaluation. Identify and treat cause: dehydration, medications (NSAIDs, ACE inhibitors, contrast dye), obstruction, sepsis. Prompt treatment may restore kidney function. Delay can lead to permanent damage.
eGFR <15 with fatigue, nausea, fluid retention
Kidney failure (Stage 5 CKD). Dialysis or transplant evaluation urgent. Symptoms indicate uremia—toxin buildup affecting whole body. Prepare for renal replacement therapy. Medical management while arranging dialysis access or transplant evaluation.
eGFR >90 feeling healthy
Normal kidney function. No specific action needed. Maintain kidney-healthy habits: stay hydrated, control blood pressure and blood sugar, avoid nephrotoxins (NSAIDs when possible), regular exercise, balanced diet.
Your Action Plan Based on Results
If your eGFR is ≥90 (Normal):
- Excellent kidney function
- Maintain kidney-healthy habits:
- Stay well-hydrated
- Control blood pressure and blood sugar
- Avoid unnecessary NSAIDs
- Regular exercise
- Balanced diet, moderate protein
- No specific monitoring needed beyond routine care
If your eGFR is 60-89 (Mildly decreased):
- Usually normal aging if no other signs of kidney damage
- Evaluate for:
- Protein in urine (albumin/creatinine ratio)
- Blood pressure
- Blood sugar (diabetes screening)
- Medications that affect kidneys
- Repeat testing to confirm trend
- If other kidney damage markers present:
- May indicate early CKD
- Medical evaluation recommended
- Focus on preventing progression
If your eGFR is 30-59 (CKD Stage 3):
- Chronic kidney disease present
- Nephrology consultation recommended
- Comprehensive management:
- Blood pressure control (＜130/80 target)
- Diabetes management if present
- Medication review (avoid nephrotoxins)
- Cardiovascular risk reduction
- Monitor for progression (eGFR trend, proteinuria)
- Dietary modifications if recommended
- Vaccinations (hepatitis B, flu, pneumonia)
- Prepare for possible future dialysis/transplant
If your eGFR is 15-29 (CKD Stage 4):
- Severe CKD
- Nephrology care essential
- Aggressive management:
- All Stage 3 measures
- Prepare for renal replacement therapy
- Dialysis access planning
- Transplant evaluation if candidate
- Anemia management
- Bone mineral disease management
- Frequent monitoring
If your eGFR is ＜15 (CKD Stage 5):
- Kidney failure
- Urgent nephrology care
- Dialysis or transplant needed
- Plan renal replacement therapy
- Manage complications: anemia, bone disease, fluid overload, electrolytes, cardiovascular disease
The eGFR Race Adjustment
Historically, eGFR calculations included a race adjustment factor for Black patients. Many laboratories are removing this adjustment as it may perpetuate health disparities. The best eGFR calculation uses cystatin C (not affected by muscle mass) instead of or in addition to creatinine. Discuss with your doctor which calculation is most appropriate for you.
Common Questions
Track Your Estimated GFR Results
Monitor your levels over time, identify trends, and share your history with your doctor.