Kidney function is often tracked using creatinine and eGFR. Many kidney issues have no symptoms early, so labs matter.
Quick summary
- eGFR estimates kidney filtering function (calculated from creatinine and other factors).
- Hydration, muscle mass, illness, and medications can affect results.
- Trends over time matter.
What can affect results
- Dehydration or recent illness
- Muscle mass and heavy exercise
- Certain medications/supplements
- Long-term conditions like diabetes or high blood pressure
When to follow up
- New abnormal results or rising creatinine trend
- Protein in urine
- Swelling, decreased urination
- Persistent vomiting/diarrhea
Electrolytes (potassium/sodium)
- Abnormal potassium can affect heart rhythm; sodium shifts can cause confusion or weakness. Abnormal values deserve timely review.
Next step
More resources: Kidney & Electrolytes. Book a visit for abnormal kidney labs—early action can help prevent progression.
Last reviewed: Dec 28, 2025