Chronic renal failure stages describe how kidney function changes as chronic kidney disease progresses.

The kidneys filter waste and excess fluid from the blood while helping regulate electrolytes, blood pressure, red blood cell production and bone health. When kidney damage or reduced kidney function persists over time, it may be classified as chronic kidney disease (CKD).

CKD is generally categorized into stages according to the estimated glomerular filtration rate (eGFR). Understanding the stage can help doctors determine the appropriate monitoring, treatment and preparation for possible complications.

Importantly, not everyone with CKD progresses to kidney failure. Early detection and appropriate management of conditions such as diabetes, high blood pressure and proteinuria can help reduce the risk of progression.

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides specialized evaluation and management for chronic kidney disorders.

What Does eGFR Mean?

The estimated glomerular filtration rate (eGFR) is an estimate of how efficiently the kidneys filter blood.

A lower eGFR generally indicates reduced kidney filtration. However, CKD staging should not be based on a single eGFR value alone.

Doctors also consider:

• Evidence of kidney damage

• Urine albumin levels

• Previous kidney function results

• Underlying medical conditions

• Blood pressure

• Diabetes

• Imaging findings

• Overall health

Persistence over time is important when diagnosing chronic kidney disease.

Chronic Kidney Disease Stage Chart

The commonly used G categories are:

CKD Stage	eGFR Range	General Description
Stage 1 / G1	90 or higher	Normal or high filtration with evidence of kidney damage
Stage 2 / G2	60–89	Mildly reduced filtration with evidence of kidney damage
Stage 3a / G3a	45–59	Mild to moderately reduced kidney function
Stage 3b / G3b	30–44	Moderately to severely reduced kidney function
Stage 4 / G4	15–29	Severely reduced kidney function
Stage 5 / G5	Less than 15	Kidney failure

Stage 1 and Stage 2 require evidence of kidney damage for a CKD diagnosis.

Stage 1 Chronic Kidney Disease

In Stage 1 CKD, eGFR is generally 90 or above, but there is evidence of kidney damage.

Possible evidence includes:

• Albumin in urine

• Persistent blood in urine due to kidney disease

• Structural abnormalities

• Certain imaging findings

• Genetic or pathological abnormalities

Most people do not experience noticeable symptoms at this stage.

Treatment Focus

Management may include:

• Controlling blood pressure

• Managing diabetes

• Addressing albuminuria

• Maintaining a healthy lifestyle

• Avoiding unnecessary kidney-harming medicines

• Regular kidney monitoring

The goal is to identify and manage the underlying cause before significant kidney function is lost.

Stage 2 Chronic Kidney Disease

Stage 2 generally corresponds to an eGFR of 60–89, together with evidence of kidney damage.

Symptoms may still be absent.

Doctors may focus on identifying the cause and monitoring:

• eGFR

• Urine albumin

• Blood pressure

• Blood glucose

• Other relevant laboratory parameters

Lifestyle and medical management remain important at this stage.

Stage 3 Chronic Kidney Disease

Stage 3 is divided into:

• Stage 3a: eGFR 45–59

• Stage 3b: eGFR 30–44

Kidney function is more noticeably reduced compared with earlier stages.

Some people may still have no symptoms, while others may experience:

• Fatigue

• Swelling

• Changes in urination

• Muscle cramps

• Anemia

• Blood pressure problems

The risk of complications becomes greater as kidney function declines.

Treatment During Stage 3

Treatment may involve:

• Blood pressure management

• Diabetes control

• Management of albuminuria

• Medication review

• Appropriate dietary planning

• Monitoring potassium and other electrolytes

• Evaluation for anemia and bone-mineral abnormalities

• Regular assessment of kidney function

The exact treatment depends on the cause and individual laboratory findings.

Stage 4 Chronic Kidney Disease

Stage 4 generally corresponds to an eGFR of 15–29.

At this stage, kidney function is severely reduced.

Possible symptoms include:

• Increasing tiredness

• Loss of appetite

• Nausea

• Swelling

• Itching

• Changes in urination

• Sleep problems

• Muscle cramps

• Difficulty concentrating

• Breathlessness caused by fluid accumulation

However, symptoms vary significantly from one person to another.

Why Stage 4 Requires Careful Planning

Stage 4 CKD is an important point for specialist follow-up.

Management may include:

• Treating the underlying kidney disease

• Controlling blood pressure

• Managing diabetes

• Treating anemia

• Managing mineral and bone abnormalities

• Monitoring potassium and acid-base balance

• Reviewing medicines

• Discussing kidney replacement therapy if progression continues

If kidney function is declining, early discussions about dialysis or transplantation can allow patients and families to make informed decisions without waiting for an emergency.

Stage 5 Chronic Kidney Disease

Stage 5 CKD, also called kidney failure, generally corresponds to an eGFR below 15.

The kidneys have severely reduced filtering capacity.

Patients may develop complications such as:

• Severe fluid retention

• Electrolyte abnormalities

• Metabolic acidosis

• Anemia

• Loss of appetite

• Nausea or vomiting

• Severe fatigue

• Itching

• Sleep disturbances

• Breathlessness

• Confusion in severe cases

Not every patient experiences all of these symptoms.

Does Stage 5 Automatically Mean Dialysis?

Not necessarily based on eGFR alone.

The decision to initiate dialysis depends on the patient's overall clinical condition.

Doctors may consider:

• Symptoms caused by kidney failure

• Fluid overload

• Persistent electrolyte abnormalities

• Acid-base problems

• Nutritional deterioration

• Uremic complications

• Overall kidney function

• Response to medical treatment

Dialysis may be temporary in some cases of acute kidney injury, while patients with irreversible advanced kidney failure may require long-term kidney replacement therapy.

Kidney Transplant as a Treatment Option

For medically suitable patients with kidney failure, kidney transplantation may provide another form of kidney replacement therapy.

A transplant involves replacing failed kidney function with a functioning donor kidney.

Patients being considered for transplantation require detailed medical assessment to determine suitability.

Transplantation is not appropriate for everyone, and the decision involves multiple medical factors.

What Causes Chronic Kidney Disease to Progress?

Several factors can contribute to worsening kidney function, including:

• Poorly controlled diabetes

• Uncontrolled hypertension

• Persistent significant proteinuria

• Certain progressive kidney diseases

• Recurrent kidney injury

• Urinary obstruction

• Smoking

• Cardiovascular disease

• Inappropriate use of certain medicines

The rate of progression varies considerably between individuals.

Can Chronic Renal Failure Be Stopped?

In many patients, progression can be slowed, although established chronic kidney damage may not be completely reversed.

Management focuses on the cause and risk factors.

Important measures may include:

Control Blood Pressure

Maintaining blood pressure within the target recommended by the treating doctor can help protect kidney function.

Manage Diabetes

Appropriate blood glucose management is important for people with diabetes and kidney disease.

Treat Proteinuria

Persistent albumin or protein in urine can indicate increased kidney risk. Appropriate medicines may reduce albuminuria in selected patients.

Avoid Unnecessary Kidney-Harming Medicines

Some medicines, particularly certain painkillers, can be harmful to the kidneys when used inappropriately.

Follow an Individualized Diet

Dietary recommendations may involve sodium, protein, potassium, phosphorus or fluid adjustments depending on kidney function and blood test results.

Can Kidney Function Improve Between Stages?

Sometimes.

If an acute and reversible problem occurs on top of chronic kidney disease, treating that problem may improve kidney function.

For example, kidney function can sometimes improve after treating:

• Dehydration

• Infection

• Urinary obstruction

• Certain medication-related kidney injuries

However, permanent chronic kidney damage generally cannot simply be reversed.

Warning Signs That Require Prompt Medical Attention

People with advanced CKD should seek urgent medical attention for symptoms such as:

• Severe breathlessness

• Chest pain

• Confusion

• Very little or no urine

• Persistent vomiting

• Severe swelling

• Severe weakness

• Sudden deterioration in health

These symptoms can indicate serious complications and should not be managed through home remedies alone.

How Often Should Kidney Function Be Checked?

The frequency of monitoring depends on the CKD stage, cause, urine albumin level, treatment and rate of progression.

People with more advanced disease may require more frequent monitoring of:

• Creatinine and eGFR

• Urine albumin

• Potassium

• Bicarbonate

• Hemoglobin

• Calcium and phosphorus

• Blood pressure

Your nephrologist can determine the appropriate testing schedule.

Chronic Kidney Disease Care at Prabhakar Bhurke Clinic

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke provides super specialist nephrology and transplant-related care.

Patients may receive evaluation and management for:

• Early-stage CKD

• Progressive renal disease

• Diabetes-related kidney disease

• Hypertension-related kidney disease

• Proteinuria

• Acute kidney injury

• Advanced kidney failure

• Dialysis-related care

• Kidney transplant evaluation

The treatment plan is individualized according to the patient's CKD stage, underlying cause, laboratory findings and overall medical condition.

Frequently Asked Questions

What are the 5 chronic renal failure stages?

The five broad CKD stages are based primarily on eGFR: Stage 1, Stage 2, Stage 3, Stage 4 and Stage 5. Stage 3 is further divided into 3a and 3b.

Which stage of kidney disease requires dialysis?

Dialysis is generally associated with kidney failure, but it is not started solely because a patient reaches a particular eGFR. Symptoms, complications and overall clinical condition determine when dialysis is appropriate.

Is Stage 4 kidney disease reversible?

Established Stage 4 CKD usually represents severe chronic reduction in kidney function. It may not be reversible, although treating reversible contributors and controlling the underlying disease can sometimes improve kidney function or slow progression.

What is Stage 5 kidney failure?

Stage 5 CKD generally means an eGFR below 15 and is commonly referred to as kidney failure. Some patients require dialysis or transplantation, while treatment decisions depend on their clinical condition.

Can someone remain stable with chronic kidney disease?

Yes. CKD does not progress at the same rate in everyone. Appropriate treatment of the underlying cause and risk factors may help some patients remain stable for a long period.

Conclusion

Understanding chronic renal failure stages can help patients recognize why kidney function monitoring is important. CKD ranges from early disease with evidence of kidney damage to advanced kidney failure requiring consideration of kidney replacement therapy.

The eGFR provides an important measure of kidney filtration, but treatment decisions should also consider urine albumin, symptoms, underlying disease and other laboratory findings.

Early diagnosis, blood pressure and diabetes management, appropriate medicines, lifestyle measures and regular nephrology follow-up can help protect kidney function and reduce complications.

For specialized evaluation and individualized kidney care, consult Dr. Sandip Prabhakar Bhurke at Prabhakar Bhurke Clinic.

Medical Disclaimer

This article is intended for general educational purposes only and does not constitute medical advice, diagnosis or treatment. CKD staging and treatment decisions require professional assessment of eGFR, evidence of kidney damage, urine findings, medical history and other clinical factors. An individual should not start or stop medicines, change fluid or dietary intake, or decide about dialysis based solely on information in this article. Seek urgent medical attention for severe breathlessness, chest pain, confusion, very little or no urine, persistent vomiting, severe swelling or sudden worsening of health. Consult Dr. Sandip Prabhakar Bhurke or another qualified nephrologist for personalized medical evaluation and treatment.