Doctor's Assessment Included
Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.
eGFR: Normal Values and What a Reduced eGFR Means
eGFR monitoring is essential for healthy ageing, as kidney function naturally declines with age. After age 40, eGFR typically decreases by about 1 mL/min per year. Regular testing helps distinguish normal age-related decline from concerning kidney disease and guides appropriate medical decisions.
Results within 1–3 working days after your blood draw (estimate)
Reference Ranges
Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.
Check your own valueWhat It Measures
eGFR estimates the volume of blood that your kidneys filter per minute, expressed in millilitres per minute per 1.73 square metres of body surface area. It is calculated using blood creatinine or cystatin C levels, combined with factors such as age and sex.
A normal eGFR is generally above 90 mL/min. Values between 60 and 89 may indicate mildly reduced function, 30 to 59 suggests moderate impairment, 15 to 29 indicates severe reduction, and below 15 may indicate kidney failure.
Why It Matters
eGFR is the most important single measure for assessing overall kidney function. It is used internationally to diagnose chronic kidney disease, determine its stage, and guide treatment decisions.
Regular eGFR monitoring allows early detection of kidney function decline, often before symptoms appear. This is critical because early intervention can significantly slow the progression of kidney disease and reduce the risk of complications such as cardiovascular disease.
When to Test
eGFR is routinely calculated as part of standard blood work whenever creatinine is measured. It is especially important for individuals with risk factors for kidney disease, including diabetes, high blood pressure, cardiovascular disease, and a family history of kidney problems.
More frequent monitoring is recommended for those with an established diagnosis of chronic kidney disease, or for individuals taking medications that may affect kidney function.
Symptoms
Low Levels
Swelling in the legs, ankles, feet, or around the eyes
High blood pressure
Nausea or loss of appetite
Difficulty concentrating or mental fogginess
High Levels
May reflect normal healthy kidney function
Very high values can occasionally be seen in early diabetes or pregnancy
Recommendations
Male
Low eGFR indicates reduced kidney function. Consult a nephrologist for evaluation and management.
Normal to high eGFR indicates healthy kidney function. Maintain kidney-healthy habits.
Female
Low eGFR indicates reduced kidney function. Consult a nephrologist for evaluation and management.
Normal to high eGFR indicates healthy kidney function. Maintain kidney-healthy habits.
Lifestyle Tips
Protect your kidney function by managing blood pressure and blood sugar levels within healthy ranges. Stay well hydrated and maintain a balanced diet that is not excessively high in sodium or protein.
Engage in regular physical activity, maintain a healthy weight, and avoid smoking. Limit the use of over-the-counter pain medications, particularly NSAIDs, which can damage the kidneys over time. Always discuss medication use with your healthcare provider.