Normal Kidney Function

Healthy kidneys are essential for filtering blood, balancing fluids and electrolytes, and supporting vital body functions. Learn how to recognize normal kidney function and when to seek help.

✅ What Do Healthy Kidneys Do?

• Filter about 50 gallons (180 liters) of blood per day
• Remove waste, toxins, and extra fluid via urine
• Regulate blood pressure through renin production
• Balance key electrolytes like sodium, potassium, and calcium
• Produce erythropoietin to stimulate red blood cells
• Activate vitamin D to support bone health

🧪 How Do You Know If Your Kidneys Are Working Normally?

• Creatinine blood test: Measures waste in the blood
• eGFR (estimated Glomerular Filtration Rate): Normal is 90 or above
• Urine test: Looks for protein or blood in urine
• Blood pressure check: Detects kidney-related hypertension

💡 Signs Your Kidneys Are Functioning Well

• Clear or pale yellow urine
• No swelling in hands, feet, or ankles
• Stable blood pressure
• Consistent appetite and energy
• No unusual changes in urination

📊 Normal Creatinine Clearance (CrCl)

• Men: 90–140 mL/min
• Women: 80–130 mL/min

Use our CrCl Calculator to estimate your kidney function.

🚨 When to See a Doctor

• Swelling in legs or ankles
• Persistent fatigue
• Changes in urine color or frequency
• High blood pressure
• Nausea or loss of appetite