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biomarkers

eGFR and creatinine for longevity: how to interpret kidney markers

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# eGFR and creatinine for longevity: how to interpret kidney markers Creatinine and eGFR are among the most important kidney-related lab markers. For longevity, they matter not only medically, but also when supplements, protein, training or medication are part of the picture. LongLifeScan uses kidney markers cautiously and does not diagnose. ## Short answer You may find the values as: - creatinine - eGFR - estimated glomerular filtration rate eGFR is often calculated from creatinine, age and other factors. 👉 [Start the free report](/en/reports/generate#free-report) ## What is creatinine? Creatinine is connected to muscle metabolism and kidney function. It can be influenced by muscle mass, training, nutrition and supplements. ## What is eGFR? eGFR is an estimated kidney filtration rate. It is not a direct measurement, but a calculation. ## What can influence these values? - muscle mass - intense training - creatine supplements - protein intake - dehydration - medication - acute illness - age - lab formula ## How does LongLifeScan use eGFR/creatinine? The report uses these values as safety and context markers: - review supplements more carefully - consider protein/nutrition context - check lab quality - generate clinician questions - suggest retesting context ## What if they are missing? Leave them empty. If you use many supplements, eat high protein or take medication, kidney markers may be especially relevant. ## Questions for clinician or lab - Which eGFR formula was used? - Should cystatin C be added? - Could training, creatine or dehydration have influenced the value? - Would retesting make sense? ## Related topics - [Interpret creatine](/en/interpret-creatine) - [Evaluate supplements responsibly](/en/evaluate-supplements-responsibly) - [Which blood tests for longevity?](/en/which-blood-tests-for-longevity) ## Conclusion eGFR and creatinine are important context markers. They help interpret labs, supplements, training and nutrition more safely.

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LongLifeScan is intended for generally healthy adults.

The analyses, plans and recommendations are for health education, self-observation and better preparation of questions. They do not replace medical diagnosis, treatment or professional advice.

If you have existing medical conditions, acute symptoms, abnormal lab values, symptoms, medication use, pregnancy or a mental health crisis, always seek medical help or qualified medical advice.

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