What is eGFR?
Estimated Glomerular Filtration Rate (eGFR) measures how efficiently your kidneys filter waste and maintain fluid balance. It provides a calculated estimate based on blood creatinine, age, sex, and body size.
Why does it matter for long-term health and wellbeing?
eGFR reflects how well your kidneys are supporting your body’s metabolic functions, including waste removal, fluid balance, and nutrient regulation. Tracking it over time helps you understand how your lifestyle impacts internal systems related to energy and metabolic health.
What’s an optimal level of eGFR?
- Optimal range: > 90 mL/min/1.73 m²
- Reference range: 60 – > 90 mL/min/1.73 m² (values between 60 – 90 may indicate a gradual decline with age)
What influences eGFR levels?
Hydration, physical activity, diet quality, body composition, and age can all influence eGFR results. Muscle mass and recent protein intake may temporarily alter readings, while lifestyle factors such as sleep, stress, and consistent movement support kidney and metabolic function.
What does it mean if eGFR is outside the optimal range?
A lower eGFR can signal your kidneys are filtering less efficiently, which may relate to changes in hydration, body composition, or metabolic strain. It’s worth reviewing your nutrition, fluid intake, and recovery habits, and considering retesting to monitor trends.
How can I support healthy eGFR levels?
Stay well hydrated, maintain a balanced diet rich in whole foods, support regular movement, manage stress, and aim for restorative sleep. These habits promote optimal kidney function and overall metabolic balance.
This information is provided for general health and wellness purposes only and does not replace medical advice.
References
- Kidney Health Australia. (2025). Estimated Glomerular Filtration Rate (eGFR) factsheet. Kidney Health Australia.
- Pathology Tests Explained. (2025). eGFR (Estimated Glomerular Filtration Rate).
- RCPA Manual. (2024). GFR estimated. The Royal College of Pathologists of Australasia.
Dawson, J. et al. (2025). Re-thinking kidney function: a new approach to kidney function estimation and implications. Medical Journal of Australia.
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