GFR Calculator (CKD-EPI 2021)

It is normal for kidney function to decline slightly with age. While a GFR > 90 is standard for young adults, a GFR of 60-89 is often considered acceptable for seniors (age 60+), provided there is no protein in the urine. However, a result consistently below 60 usually signals Chronic Kidney Disease (CKD) regardless of age.

While scar tissue in the kidneys cannot be reversed, you can slow the decline or improve numbers affected by dehydration. Key strategies include: staying hydrated, reducing sodium intake to lower blood pressure, and limiting high-protein meals (which increase creatinine load). Always consult a renal dietitian before changing your diet.

These two numbers have an inverse relationship. Creatinine is a waste product from muscle wear-and-tear. If your kidneys are filtering slowly (Low GFR), this waste builds up in the blood (High Creatinine). Therefore, a high creatinine level is the primary "red flag" that triggers a low GFR result.