MyKidneyDiseaseTeam

Yes, GFR can fluctuate! It's not a perfectly fixed number. Several factors can influence your result from one test to the next, including:

- How hydrated you were at the time of the test
- Recent food or salt intake
- Physical stress or illness
- Muscle mass changes
- Your biological sex and age (used in the calculation)

A Show Full Answer

Yes, GFR can fluctuate! It's not a perfectly fixed number. Several factors can influence your result from one test to the next, including:

- How hydrated you were at the time of the test
- Recent food or salt intake
- Physical stress or illness
- Muscle mass changes
- Your biological sex and age (used in the calculation)

A GFR is calculated using creatinine levels in your blood, along with your age and sex. If any of those variables shift even slightly, your result can change. That said, a jump from 16 to 24 in a month is a meaningful change — and generally a welcome one! It could mean your kidneys responded well to a treatment change, better hydration, or reduced stress on them.

It's really worth discussing this with your nephrologist to understand what may have driven the improvement and how to keep that momentum going. They may also want to retest to confirm the trend is consistent.

 AI-generated responses are not a substitute for medical advice. These services are not intended to diagnose, treat, or cure any condition or disease. Always ask your doctor about specific health concerns.

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