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Nutrition

Glomerular Filtration Rate (GFR)

Glomerular filtration rate (GFR) estimates kidney filter speed from labs—interpret trends with clinicians, not one off-cycle reading after dehydration or heavy training.

Glomerular filtration rate (GFR) estimates how many milliliters per minute your kidneys filter blood, usually derived from creatinine, age, and sex in an eGFR lab result. Higher is generally better within normal ranges; sustained drops can signal chronic kidney disease stages that need medical follow-up.

A single low reading after hard training or dehydration may not define disease—trend and repeat labs matter.

Common questions

  • Can hard training temporarily change eGFR?

    Dehydration, high protein intake, and creatine can shift creatinine and estimated GFR on a single draw. Repeat fasting labs and clinical review beat panic from one post-block test.

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