CKD Stages Explained: What Stage 1 to 5 Means for You
Quick answer: Chronic kidney disease (CKD) has 5 stages. Your stage comes from your eGFR — a number most lab reports show at the bottom. Stage 1 is 90 or higher, stage 5 is under 15. Most people find out in stage 2 or 3, when there are still no symptoms. Knowing your stage tells you what to watch and what to ask your doctor next.
If you just got blood work back and saw “eGFR” with a number you don’t understand, this page is for you. No medical degree needed — just the chart, what each stage means in plain language, and the questions worth asking.
The CKD stages chart
Your eGFR (estimated glomerular filtration rate) estimates how well your kidneys filter blood. It’s calculated from your creatinine, age, and sex — you don’t need to do anything to get it; the lab does it.
| Stage | eGFR number | What it means | Typical feel |
|---|---|---|---|
| Stage 1 | 90+ | Kidney damage (like protein in urine) but filtering still normal | No symptoms |
| Stage 2 | 60–89 | Mild loss of filtering | No symptoms |
| Stage 3a | 45–59 | Mild-to-moderate loss | Usually still no symptoms |
| Stage 3b | 30–44 | Moderate-to-severe loss | Fatigue, swelling may start |
| Stage 4 | 15–29 | Severe loss | Symptoms common; prep for decisions |
| Stage 5 | under 15 | Kidney failure | Dialysis or transplant talk |
The same eGFR number on your lab sheet maps you to one row. If your number sits near a border (say 58 or 31), your stage can flip back and forth between tests — that’s normal, and it’s why doctors look at the trend, not one reading.
Why stage matters less than the trend
Here’s what most pages won’t tell you: a single stage label is less important than where you’re heading. Two people with stage 3b can be on very different paths — one stable for years, one sliding toward stage 4. Your lab history shows which.
What actually moves the needle, at every stage:
- Blood pressure control — the #1 driver of kidney decline. Most kidney guidelines target under 130/80 (CDC).
- Heart disease is the real thing to watch — kidney disease and cardiovascular risk travel together, which is why the same numbers (blood pressure, cholesterol, blood sugar) get checked at every visit.
- Blood sugar control — if you have diabetes, it’s the other half of the equation.
- Medication review — some common drugs (including NSAIDs like ibuprofen) strain kidneys. Your pharmacist can flag these in minutes.
- Protein in your urine (albuminuria) — if your lab shows this, it changes your stage treatment even with a decent eGFR.
A few terms you’ll meet in nephrology clinics, for completeness: doctors may call stage 3a and stage 3b by name, and describe the disease as mild to moderate kidney damage in its early stages. Long term, uncontrolled chronic kidney disease (CKD) affects more than filtration — the kidneys filter waste, make red blood cells via hormone signaling, and keep bones strong by balancing phosphorus. That’s why a urine test for protein in your urine and controlling blood pressure are checked at every visit, and why high blood pressure is both cause and consequence. In later stages the conversation shifts to dialysis or a kidney transplant, what’s called end stage kidney disease (ESKD) — the same condition older textbooks call kidney failure.
What to do at each stage
Stages 1–2: You mostly protect, not treat. Keep blood pressure and blood sugar in range, stay hydrated, avoid smoking. Ask: “Is there protein in my urine?”
Stage 3: This is the working stage. You’ll likely see a nephrologist for the first time, and diet starts to matter in specific ways — potassium and phosphorus enter the conversation. This is where our stage 3 CKD meal planning guide saves the most math. Ask: “What are my potassium and phosphorus levels?”
Stage 4: Time to learn the options before you need them — not during a crisis. Ask: “Should we talk about what happens if my kidneys keep declining?”
Stage 5: Dialysis, transplant, or conservative care. The National Kidney Foundation has decision guides your care team can walk through with you.
The two numbers on your lab report that pair with eGFR
- Creatinine — the waste product eGFR is calculated from. Rising creatinine = falling kidney function.
- uACR (urine albumin-to-creatinine ratio) — detects the damage eGFR can miss. If you’ve never had one, ask for it.
And when your report shows BUN next to creatinine, that pair has its own story — the ratio explained here.
Two things shift this number without meaning disease: muscle mass (low muscle = lower eGFR at the same kidney function) and age (eGFR drifts down slowly in everyone). Your doctor reads the number against both.
The honest bottom line
Most people with CKD will never reach stage 5. Stage 3 caught early and managed well often stays put for decades. The stage label isn’t a countdown — it’s a starting point for a conversation with your care team.
If you want the kitchen-level version of stage 3 eating — meals that fit potassium, phosphorus, and blood pressure targets without weighing everything — the balanced-meals guide is here.
This page is education, not medical advice. Bring your lab numbers to your own doctor or nephrologist — they know your history.
Sources: CDC Chronic Kidney Disease Basics · KDIGO CKD Guideline · National Kidney Foundation
This guide is also available in Spanish: Etapas de la enfermedad renal crónica: tabla TFGe.
Frequently asked questions
What do the CKD stages actually mean?
Chronic kidney disease has 5 stages, and your stage comes from your eGFR — a number most lab reports show at the bottom. Stage 1 is 90 or higher, stage 5 is under 15. Most people find out in stage 2 or 3, when there are still no symptoms.
What should I do at stage 3 CKD?
Stage 3 is the working stage. You'll likely see a nephrologist for the first time, and diet starts to matter in specific ways — potassium and phosphorus enter the conversation. The questions worth asking are what your potassium and phosphorus levels are, and whether there is protein in your urine.
Does one eGFR reading decide my stage?
No. If your number sits near a border, say 58 or 31, your stage can flip back and forth between tests — that's normal, and it's why doctors look at the trend, not one reading. Two people with stage 3b can be on very different paths, one stable for years, one sliding toward stage 4.
Can stage 3 kidney disease stay stable for years?
Yes. Most people with CKD will never reach stage 5, and stage 3 caught early and managed well often stays put for decades. Blood pressure control is the number one driver of kidney decline, with most kidney guidelines targeting under 130/80.
What is uACR and should I ask for it?
uACR is the urine albumin-to-creatinine ratio, and it detects the damage eGFR can miss. If you've never had one, ask for it. If your lab shows protein in your urine, it changes your stage treatment even with a decent eGFR.
Want the complete system?
This guide is based on Hardy's ebooks — plain-language, step-by-step PDFs you can read in one sitting. See all guides
Educational content only — not a substitute for advice from your doctor or pharmacist. Always work with your care team.