What Are the Stages of Chronic Kidney Disease (CKD)?
If you're wondering what the stages of chronic kidney disease (CKD) are, here's the simple answer: CKD is divided into five stages based on how well your kidneys filter waste from your blood, which is measured using your estimated glomerular filtration rate (eGFR). The lower your eGFR, the more advanced the kidney damage.
Now, before you imagine your kidneys dramatically waving a white flag, here's the good news: not every stage feels the same, and early-stage CKD often has little to no symptoms. That's exactly why understanding the stages matters. Think of it like your phone battery. At 90%, you're relaxed. At 10%, you're searching for a charger with Olympic-level urgency. Your kidneys also send signals; but sometimes they're a little too polite in the beginning.
Let's break down each stage in a simple, friendly way.
Understanding Chronic Kidney Disease (CKD)
Chronic kidney disease is a long-term condition where the kidneys gradually lose their ability to filter waste, extra fluid, and toxins from the blood. Unlike a sudden kidney injury, CKD develops slowly over months or years.
Healthy kidneys quietly work around the clock by:
- Filtering waste products
- Balancing minerals like sodium and potassium
- Regulating blood pressure
- Producing hormones that help make red blood cells
- Supporting healthy bones
When kidney function declines, these jobs become harder to perform.
How Are the Stages of CKD Measured?
Doctors primarily use the estimated glomerular filtration rate (eGFR) to determine the stage of CKD.
The eGFR estimates how much blood your kidneys filter every minute.
- Stage 1: eGFR 90 or higher – Normal filtration but signs of kidney damage
- Stage 2: eGFR 60–89 – Mild loss of kidney function
- Stage 3a: eGFR 45–59 – Mild to moderate loss
- Stage 3b: eGFR 30–44 – Moderate to severe loss
- Stage 4: eGFR 15–29 – Severe kidney damage
- Stage 5: eGFR Below 15 – Kidney failure
Think of eGFR like your kidney's report card. Stage 1 says, "Doing okay, but please pay attention." Stage 5 says, "We seriously need help now."
