eGFR and creatinine for longevity: how to interpret kidney markers
Existing knowledge article; not a hands-on product test.
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.
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?
Consider the following points when interpreting this information:
- 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
Conclusion
eGFR and creatinine are important context markers. They help interpret labs, supplements, training and nutrition more safely.