Kidney Disease Stages 1–5: CKD Guide

What chronic kidney disease is

Chronic kidney disease is a gradual loss of kidney function over months to years, staged 1 to 5 by eGFR (estimated glomerular filtration rate) together with albuminuria under the KDIGO framework.³ It affects about 10% of the population and is often silent until advanced — which is why early detection matters: controlling blood pressure and diabetes can significantly slow progression and prevent dialysis.

The two most common causes worldwide are diabetes and high blood pressure, together accounting for about 60–70% of cases. Others include glomerulonephritis, polycystic kidney disease, repeated urinary infections, obstruction from stones, long-term NSAID use and autoimmune conditions such as lupus.

CKD: myths vs facts

Kidney numbers are among the most misread results in medicine. Here is what the evidence says:

MYTH A reasonable eGFR means the kidneys are fine.

FACT eGFR alone is half the picture. A collaborative meta-analysis of over 105,000 people with albumin-to-creatinine ratio measured found that eGFR and albuminuria predict mortality independently — and their effects multiply rather than overlap. Two people with identical eGFR can carry very different risk depending on urinary albumin. Albuminuria raised risk with no threshold below which it stopped mattering.²

MYTH Stage 3 CKD means dialysis is coming.

FACT Most people with CKD stage 3 never need dialysis. Stage 3 calls for monitoring and lifestyle modification to slow progression; dialysis is typically considered only when eGFR falls below 10–15 mL/min.

MYTH You would feel it if your kidneys were failing.

FACT Early CKD has no symptoms — that is precisely why it is called a silent disease. Swelling, foamy urine, fatigue and itching appear late. Blood and urine tests are the detection system, not symptoms.

MYTH Drinking extra water flushes kidney disease away.

FACT No evidence supports this. What slows progression is blood pressure control (target below 130/80, with ACE inhibitors or ARBs for proteinuric CKD), diabetes control, smoking cessation, avoiding NSAIDs — and SGLT2 inhibitors, which cut CKD progression by roughly 40%.¹

MYTH All blood pressure tablets are bad for the kidneys.

FACT ACE inhibitors and ARBs protect kidneys in proteinuric CKD. The real hazard is the combination of an ACE inhibitor or ARB plus a diuretic plus an NSAID — the “triple whammy” — which is associated with a significant rise in impaired renal function, and the reason sick-day rules exist during dehydrating illnesses.⁴

What to do next

Kidney results are always read as a pair — eGFR plus albuminuria. Find your situation:

Your situation	Sensible next step	When to seek care promptly
eGFR 45–59, no albuminuria	Annual monitoring, blood pressure and diabetes control, address cardiovascular risk. Ask about repeat ACR.	If eGFR falls rapidly between tests.
Any eGFR with raised albuminuria	Discuss ACE inhibitor or ARB therapy and tighter BP/diabetes targets with your doctor; albuminuria multiplies risk.	Foamy urine, new swelling, or sharply rising ACR.
On ACE inhibitor/ARB + diuretic, now vomiting or with diarrhoea/fever	Follow sick-day rules: temporarily stop the ACE inhibitor/ARB, diuretic, NSAID and metformin until fluid intake is normal again; restart only as agreed with your clinician.	If you cannot keep fluids down for over 24 hours, or urine output drops sharply.
eGFR 15–29 (stage 4)	Ask about pre-dialysis planning, vascular access discussion and transplant referral — planning happens before it is needed.	Severe swelling, breathlessness, persistent nausea or confusion.
Taking NSAIDs regularly with CKD stage 3 or worse	Discuss alternatives with your doctor; NSAIDs reduce renal blood flow and are best avoided from stage G3b.	After any NSAID course, ask whether kidney function should be rechecked.

CKD stages and key actions

CKD is staged by eGFR and albuminuria under the KDIGO classification:³

Stage	eGFR	Key actions
G1	≥90 (with kidney damage markers)	Treat cause; BP below 130/80; annual monitoring
G2	60–89	As above; lifestyle; address cardiovascular risk
G3a	45–59	Nephrology if rapid decline; anaemia and bone disease screening
G3b	30–44	Nephrology referral; avoid nephrotoxic drugs; prepare for replacement-therapy discussion
G4	15–29	Pre-dialysis planning; vascular access creation; transplant referral
G5	<15	Dialysis or kidney transplant; conservative care if chosen

Sick day rules: avoiding acute kidney injury at home

People with CKD are at higher risk of acute kidney injury during any illness that causes dehydration, such as vomiting, diarrhoea or fever. Some medicines (including certain blood pressure drugs, diuretics, NSAIDs and metformin) need review during such illnesses — but which ones, and whether to pause or continue them, is an individual decision. Ask your kidney doctor for a written sick-day plan in advance, and do not stop prescribed medicines on your own. Combining an ACE inhibitor, a diuretic and an NSAID, sometimes called the "triple whammy", is associated with a significant rise in impaired renal function.⁴ Combining an ACE inhibitor, a diuretic and an NSAID — sometimes called the "triple whammy" — is associated with a significant rise in impaired renal function, which is another reason to check with your clinician before taking NSAIDs for pain or fever.

Practical notes

Keep your kidney reports in date order — creatinine, eGFR and urine albumin together. A single eGFR reading can shift with dehydration, a heavy meal or a new medicine, so doctors read the trend across months rather than reacting to one number. Bringing the old reports saves repeat testing.

Your doctor interprets kidney numbers in context, so bring yours: recent blood pressure readings, your diabetes control if relevant, a full list of medicines (including painkillers and herbal products), and any recent illness or scan involving contrast dye. Mentioning these upfront leads to better decisions.

The lifestyle factors doctors emphasise most are blood pressure and blood sugar control, since these drive most CKD progression. Salt intake, smoking, weight and regular movement are usually discussed too. Many doctors also advise checking before using NSAID painkillers — discuss your pain relief options rather than reaching for them routinely.

How often you are retested depends on your stage: early stages might mean yearly checks, later stages more frequent monitoring, and extra tests after any medicine change. Ask your doctor what your stage means for the schedule, and what size of change in eGFR or albumin would trigger a review.

In India

In India, a kidney function panel (creatinine with eGFR) typically costs around ₹300–₹800 at private labs, and a urine albumin test around ₹300–₹600, though prices vary by city and lab. Bundled health-check packages that include both are often cheaper than ordering the tests individually.

Choose a NABL-accredited lab where possible, and home sample collection is widely available in major cities. Creatinine-based eGFR depends on the lab’s method, so the reference range printed on your own report is the one that counts.

Frequently asked questions

What causes kidney disease?

The two most common causes of CKD worldwide are diabetes (diabetic nephropathy) and high blood pressure (hypertensive nephropathy). Together they account for about 60–70% of all CKD cases. Other causes include glomerulonephritis, polycystic kidney disease, repeated urinary tract infections, kidney stones causing obstruction, long-term NSAID use, and lupus and other autoimmune conditions.

Why does kidney disease often have no symptoms?

CKD is often called a silent disease because early stages have no symptoms. Later stages cause swelling in the feet, ankles and legs, puffy face (especially around the eyes in the morning), fatigue from anaemia, foamy urine from protein loss, itchy skin, nausea and loss of appetite, shortness of breath and difficult-to-control blood pressure. Because early disease is silent, blood and urine tests are what catch it.

Do I need dialysis with CKD stage 3?

No. Most people with CKD stage 3 never need dialysis. Stage 3 requires monitoring and lifestyle modification to slow progression. Dialysis is typically considered only when eGFR falls below 10–15 mL/min.

Can CKD be reversed?

Some acute causes of a reduced eGFR — dehydration, urinary infection, NSAIDs — are reversible. True CKD with structural damage cannot be reversed, but progression can be dramatically slowed with optimal management: blood pressure control, diabetes control and appropriate medication.

What does protein in urine mean for CKD?

Proteinuria (raised albumin-to-creatinine ratio) indicates kidney damage and predicts faster progression. Even small amounts significantly increase CKD progression and cardiovascular risk. Albuminuria predicts risk independently of eGFR — the two multiply rather than overlap — which is why both numbers are always read together.

My eGFR dropped by a few points since last time — should I be worried?

Small shifts in eGFR are common and can reflect hydration, diet, medicines or simply lab variation rather than real change. Doctors look at the pattern over several readings taken months apart. Discuss the trend with your doctor instead of worrying over a single result.

Do I need to cut down on protein?

Protein needs with CKD are individual — too little causes its own problems, and very high intakes may be discussed with your doctor. There is no one-size rule worth following from the internet. Ask your doctor whether a dietitian review makes sense for your stage.

Are ayurvedic or herbal medicines safe for the kidneys?

Some herbal and traditional preparations can harm the kidneys or interact with prescribed medicines, and product quality varies. Tell your doctor about everything you take, including supplements, and discuss any new product before starting it rather than assuming ‘natural’ means safe.

I need a CT scan with contrast — is that safe with CKD?

Contrast dye can stress the kidneys, so the radiology team needs to know about your CKD in advance. Protective steps like hydration protocols are routine in this situation. Discuss it with both your doctor and the radiologist rather than cancelling or proceeding without telling them.

References

The clinical information on this page is based on peer-reviewed sources indexed in PubMed, the biomedical literature database of the US National Library of Medicine.

Chronic Kidney Disease Prognosis Consortium. Association of estimated glomerular filtration rate and albuminuria with all-cause and cardiovascular mortality in general population cohorts: a collaborative meta-analysis. Lancet. 2010;375(9731):2073–81. PMID 20483451 · doi:10.1016/S0140-6736(10)60674-5
Romagnani P, Remuzzi G, Glassock R, et al. Chronic kidney disease. Nat Rev Dis Primers. 2025;11(1):8. PMID 39885176 · doi:10.1038/s41572-024-00589-9
Levey AS, de Jong PE, Coresh J, et al. The definition, classification, and prognosis of chronic kidney disease: a KDIGO Controversies Conference report. Kidney Int. 2011;80(1):17–28. PMID 21150873 · doi:10.1038/ki.2010.483
Loboz KK, Shenfield GM. Drug combinations and impaired renal function – the 'triple whammy'. Br J Clin Pharmacol. 2005;59(2):239–243. PMID 15676048 · doi:10.1111/j.0306-5251.2004.2188.x

Medical Disclaimer: This page is for general education only and does not replace professional medical advice. Always consult a qualified healthcare provider.