Chronic kidney disease (CKD) is a long-term condition in which the kidneys gradually lose their ability to function properly or show other signs of kidney damage.
Understanding the stages of chronic kidney disease can help people make sense of their kidney test results, recognize potential health risks, and discuss appropriate care with their healthcare providers.
CKD is commonly grouped into five main stages, based primarily on estimated glomerular filtration rate (eGFR).
However, kidney disease staging involves more than one number.
Healthcare professionals also consider urine albumin levels, the underlying cause of kidney damage, and how long the abnormalities have been present.
The five stages range from early kidney damage with relatively preserved filtration to kidney failure.
Not everyone with CKD experiences the same symptoms or follows the same progression.
Some people remain stable for years, while others may experience a gradual decline in kidney function.
In this guide, you will learn what each CKD stage means, how doctors determine the stage, which tests are commonly used, and what management approaches may help protect kidney health.
You can also explore our individual guides to Chronic Kidney Disease Stage 1, Stage 2, Stage 3, Stage 4, and Stage 5 for more detailed information.
Medical reference: National Kidney Foundation – How to Classify CKD and NIDDK – Identify and Evaluate Patients with CKD.
📑 Table of Contents
- What Are the 5 Stages of Chronic Kidney Disease?
- How Are CKD Stages Determined?
- Understanding Each Stage of Chronic Kidney Disease
- Common Causes and Risk Factors of Chronic Kidney Disease
- Symptoms Across the Stages of Chronic Kidney Disease
- How Is Chronic Kidney Disease Managed?
- Can Chronic Kidney Disease Progress or Improve?
- When Should You See a Healthcare Professional?
- Take the Next Step Toward Better Kidney Health
What Are the 5 Stages of Chronic Kidney Disease?
Chronic kidney disease is generally classified into five stages based on estimated glomerular filtration rate (eGFR), a measurement that estimates how well the kidneys filter waste and excess fluid from the blood.
The five stages range from early kidney damage with preserved or mildly reduced filtration to kidney failure.
However, an eGFR result alone does not always confirm CKD. For Stages 1 and 2, there must also be another marker of kidney damage, and the abnormality must persist for at least three months.
Here is an overview of the five stages:
| CKD Stage | eGFR (mL/min/1.73 m²) | 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 filtration |
| Stage 3b (G3b) | 30–44 | Moderately to severely reduced filtration |
| Stage 4 (G4) | 15–29 | Severely reduced kidney function |
| Stage 5 (G5) | Below 15 | Kidney failure |
Source: National Kidney Foundation – How to Classify CKD.
Understanding the Five Stages
Stage 1: Early Kidney Damage
At Stage 1, eGFR is 90 or higher, indicating that the kidneys maintain a normal or high estimated filtration rate.
However, other findings, such as elevated urine albumin or structural abnormalities, indicate kidney damage.
Stage 2: Mild Kidney Damage
Stage 2 is characterized by an eGFR of 60–89 along with evidence of kidney damage.
Kidney function is mildly reduced, although many people may not experience noticeable symptoms.
Stage 3: Moderate Kidney Function Reduction
Stage 3 is divided into two categories:
- Stage 3a: eGFR of 45–59.
- Stage 3b: eGFR of 30–44.
At this stage, kidney filtration is moderately reduced.
Some people may develop complications involving blood pressure, anemia, mineral balance, or other aspects of health.
Stage 4: Severe Kidney Function Reduction
Stage 4 involves an eGFR of 15–29, indicating severely reduced kidney filtration.
Medical monitoring becomes particularly important because complications may become more common, and healthcare professionals may begin discussing future treatment options if kidney function continues to decline.
Stage 5: Kidney Failure
Stage 5 is defined by an eGFR below 15.
It represents kidney failure, although the need for dialysis or kidney transplantation is determined by the person’s symptoms, complications, overall health, and clinical circumstances—not by eGFR alone.
It is important to remember that CKD does not progress through these stages at the same rate in everyone.
Some people remain stable for many years, while others experience faster changes in kidney function.
Regular monitoring and individualized medical care help guide management decisions.
How Are CKD Stages Determined?
Healthcare professionals determine the stage of chronic kidney disease by evaluating kidney filtration, urine findings, the underlying cause of kidney damage, and how long the abnormalities have been present.
Two important measurements are estimated glomerular filtration rate (eGFR) and urine albumin-to-creatinine ratio (UACR).
Together, these tests provide valuable information about kidney function and possible kidney damage.
1. Estimated Glomerular Filtration Rate (eGFR)
The eGFR estimates how efficiently the kidneys filter waste products from the blood.
It is usually calculated using a blood creatinine test along with factors such as age and sex, depending on the equation used.
A lower eGFR generally indicates reduced kidney filtration.
Healthcare professionals use eGFR to classify kidney function into the following categories:
- G1: 90 or higher
- G2: 60–89
- G3a: 45–59
- G3b: 30–44
- G4: 15–29
- G5: Below 15
However, an eGFR of 60 or higher does not automatically mean someone has CKD.
For G1 and G2, another marker of kidney damage must also be present for at least three months.
2. Urine Albumin-to-Creatinine Ratio (UACR)
UACR is a urine test that measures the amount of albumin, a type of protein, relative to creatinine in the urine.
Healthy kidneys normally prevent most albumin from passing into the urine.
Elevated urine albumin may indicate kidney damage, even when eGFR remains relatively normal.
UACR is commonly divided into three categories:
| Albuminuria Category | UACR | Description |
|---|---|---|
| A1 | Below 30 mg/g | Normal to mildly increased |
| A2 | 30–300 mg/g | Moderately increased |
| A3 | Above 300 mg/g | Severely increased |
A higher UACR can indicate greater kidney damage and may be associated with a higher risk of CKD progression and cardiovascular complications.
3. Additional Blood and Urine Tests
Depending on the patient’s condition, healthcare professionals may recommend additional tests to understand kidney health and identify possible complications.
These may include:
- Serum creatinine: Helps calculate eGFR and assess kidney filtration.
- Blood urea nitrogen (BUN): Measures urea nitrogen in the blood, which may increase when kidney function is impaired.
- Urinalysis: Checks for protein, blood, and other abnormalities in the urine.
- Electrolyte tests: Assess substances such as potassium and bicarbonate that help maintain normal body functions.
- Complete blood count (CBC): Helps identify anemia, which can occur in more advanced CKD.
Not every patient needs all these tests.
The selection depends on the suspected cause of kidney disease, existing health conditions, and clinical findings.
4. Imaging and Other Diagnostic Procedures
In some cases, healthcare professionals may recommend kidney imaging, such as an ultrasound, to look for structural abnormalities, kidney stones, urinary obstruction, or changes in kidney size.
A kidney biopsy may also be considered when identifying the underlying cause of kidney damage would affect diagnosis or treatment decisions.
These procedures are not routinely required for everyone with CKD.
5. Why CKD Abnormalities Must Persist for at Least Three Months
Chronic kidney disease is defined by abnormalities in kidney structure or function that persist for at least three months and have implications for health.
A single abnormal blood or urine test may not be enough to establish a CKD diagnosis.
Temporary changes can occur because of dehydration, acute illness, certain medications, or other conditions.
For this reason, healthcare professionals may repeat kidney function and urine tests to determine whether the abnormalities are persistent.
Understanding eGFR and UACR together provides a more complete picture of kidney health than relying on either measurement alone.
This combined assessment helps healthcare professionals classify CKD, evaluate risk, and plan appropriate monitoring and care.
*Medical references: KDIGO 2024 Clinical Practice Guideline for CKD and National Kidney Foundation – Urine Albumin-Creatinine Ratio (uACR).
Understanding Each Stage of Chronic Kidney Disease
Each stage of chronic kidney disease represents a different level of kidney function and potential health risk.
Understanding these stages can help people recognize what their test results mean and discuss appropriate care with their healthcare providers.
However, the stage alone does not tell the entire story.
Urine albumin levels, the underlying cause of kidney damage, other health conditions, and changes over time also influence a person’s overall kidney health.
Stage 1: Early Kidney Damage
Stage 1 CKD is characterized by an eGFR of 90 or higher, along with evidence of kidney damage, such as persistent albumin in the urine or structural abnormalities.
At this stage, estimated kidney filtration remains normal or high.
Many people have no noticeable symptoms, so kidney damage may only be identified through routine blood tests, urine tests, or imaging.
Early evaluation and appropriate management of underlying conditions, such as diabetes or high blood pressure, can help reduce the risk of further kidney damage.
Learn more: Understanding Chronic Kidney Disease Stage 1
Stage 2: Mild Kidney Function Reduction
Stage 2 CKD involves an eGFR between 60 and 89, together with evidence of kidney damage that has persisted for at least three months.
Kidney filtration is mildly reduced, but many people continue to feel well and may not experience obvious symptoms.
Monitoring kidney function, checking urine albumin, managing blood pressure, and addressing underlying health conditions are important parts of care.
Learn more: Understanding Chronic Kidney Disease Stage 2
Stage 3: Moderate Kidney Function Reduction
Stage 3 CKD is divided into two subcategories:
- Stage 3a: eGFR between 45 and 59.
- Stage 3b: eGFR between 30 and 44.
At this stage, kidney filtration is moderately reduced. Some people may begin experiencing symptoms or complications, including fatigue, anemia, changes in mineral and bone metabolism, or fluid retention.
Healthcare professionals may recommend closer monitoring, medication adjustments, and additional testing to identify and manage complications.
Learn more: Understanding Chronic Kidney Disease Stage 3
Stage 4: Severe Kidney Function Reduction
Stage 4 CKD is characterized by an eGFR between 15 and 29, indicating severely reduced kidney filtration.
As kidney function declines, the risk of complications such as anemia, electrolyte imbalances, metabolic acidosis, and mineral and bone disorders may increase.
Medical supervision becomes particularly important. Healthcare professionals may also begin discussing kidney replacement therapy options, including dialysis and transplantation, if progression continues.
Learn more: Understanding Chronic Kidney Disease Stage 4
Stage 5: Kidney Failure
Stage 5 CKD, also known as kidney failure, occurs when eGFR falls below 15.
At this stage, the kidneys have severely reduced filtering capacity and may struggle to maintain the body’s fluid, electrolyte, and waste balance.
Some people may require dialysis or a kidney transplant, while treatment decisions depend on symptoms, complications, overall health, and individual circumstances. Not every person begins dialysis at the same eGFR level.
Learn more: Understanding Chronic Kidney Disease Stage 5
Why Understanding Each Stage Matters
Knowing the stage of CKD helps healthcare professionals estimate kidney disease severity, assess potential complications, and determine an appropriate monitoring and treatment plan.
However, CKD progression is not the same for everyone. Some people remain stable for years, while others experience a gradual decline in kidney function.
Regular follow-up, appropriate testing, and individualized medical care are important throughout every stage of chronic kidney disease.
Common Causes and Risk Factors of Chronic Kidney Disease
Chronic kidney disease can develop for several reasons, including long-term medical conditions, inherited disorders, and diseases that directly affect kidney tissue.
Understanding the underlying causes and risk factors can help people recognize their potential risk and discuss appropriate screening with healthcare professionals.
Two of the most common causes of CKD are diabetes and high blood pressure.
Both conditions can gradually damage the small blood vessels and filtering structures inside the kidneys.
1. Diabetes
Diabetes is one of the leading causes of chronic kidney disease.
Over time, consistently elevated blood glucose levels can damage the tiny blood vessels in the kidneys, making it harder for them to filter waste and excess fluid effectively.
This condition is known as diabetic kidney disease.
People with diabetes may benefit from regular kidney health assessments, including eGFR and urine albumin-to-creatinine ratio (UACR) testing.
Early detection can help healthcare professionals identify kidney damage and discuss appropriate management.
2. High Blood Pressure
High blood pressure can damage the blood vessels throughout the body, including those inside the kidneys.
When blood pressure remains elevated over time, these vessels may become narrowed or damaged, reducing the kidneys’ ability to function properly.
Kidney disease can also contribute to high blood pressure, creating a cycle in which each condition may worsen the other.
Managing blood pressure through appropriate medical care and lifestyle changes is an important part of protecting kidney health.
3. Cardiovascular Disease
Heart and blood vessel conditions are closely associated with chronic kidney disease.
The heart and kidneys work together to maintain circulation, fluid balance, and blood pressure. When cardiovascular function is impaired, kidney health may also be affected.
People with cardiovascular disease may have a higher risk of developing CKD and should discuss appropriate kidney monitoring with their healthcare providers.
4. Family History and Genetic Conditions
A family history of kidney disease can increase a person’s likelihood of developing certain kidney conditions.
Some inherited disorders, such as polycystic kidney disease, can directly affect kidney structure and function. Other genetic conditions may also contribute to kidney damage.
People with a strong family history of kidney disease may benefit from discussing their screening needs with a healthcare professional.
5. Other Medical Conditions and Kidney Disorders
Several other conditions can contribute to chronic kidney damage, including:
- Glomerulonephritis: Inflammation affecting the kidney’s filtering units.
- Autoimmune diseases: Conditions such as lupus can affect kidney tissue.
- Recurrent kidney infections: Repeated or severe infections may sometimes cause lasting kidney damage.
- Urinary tract obstruction: Conditions such as kidney stones or an enlarged prostate may interfere with normal urine flow.
- Congenital kidney abnormalities: Structural differences present from birth can affect kidney function.
The impact of these conditions varies depending on their severity, duration, and treatment.
6. Additional Risk Factors
Some factors may increase the likelihood of developing CKD or contribute to worsening kidney health:
- Older age
- Obesity
- Smoking
- Previous episodes of acute kidney injury
- Long-term exposure to certain medications or substances that may harm the kidneys
- A history of cardiovascular disease
Certain medications, particularly nonsteroidal anti-inflammatory drugs (NSAIDs), can affect kidney function in some circumstances. People with existing kidney disease or other risk factors should discuss medication safety with a healthcare professional.
Why Identifying the Underlying Cause Matters
Understanding what contributes to kidney damage helps healthcare professionals develop a more appropriate management plan.
For example, someone with diabetic kidney disease may need careful blood glucose management, while someone with hypertension-related kidney damage may require a different combination of blood pressure treatment and monitoring.
Identifying and addressing the underlying cause does not guarantee that CKD will be reversed or that progression will stop. However, appropriate medical care can help manage risk factors and support long-term kidney health.
*Medical references: NIDDK – Chronic Kidney Disease and National Kidney Foundation – Risk Factors for Kidney Disease.
Symptoms Across the Stages of Chronic Kidney Disease
The symptoms of chronic kidney disease can vary depending on the extent of kidney damage, the underlying cause, and whether complications have developed.
One important challenge is that many people with early-stage CKD do not experience noticeable symptoms.
Kidney damage may only be discovered through routine blood or urine tests.
As kidney function declines, some people may develop symptoms related to fluid retention, waste buildup, anemia, or changes in electrolyte balance.
However, symptoms alone cannot determine the stage of kidney disease.
Early Stages: CKD Stages 1 and 2
During Stages 1 and 2, many people feel well and have no obvious symptoms.
Kidney filtration may remain relatively preserved, even when other tests show evidence of kidney damage.
Possible findings include:
- Persistent albumin in the urine
- Foamy urine, which may be associated with excess protein
- Blood in the urine in some kidney conditions
- Abnormal findings on kidney imaging
These findings do not automatically confirm CKD. They require appropriate medical evaluation and, when relevant, repeat testing.
Moderate Stages: CKD Stages 3a and 3b
As kidney function becomes moderately reduced, some people may begin experiencing symptoms or complications.
Possible symptoms and findings include:
- Fatigue or reduced energy
- Swelling in the feet, ankles, or hands
- Changes in urination patterns
- Muscle cramps
- Difficulty concentrating
- Anemia
- Changes in mineral and bone metabolism
Not everyone with Stage 3 CKD experiences these problems. Their presence and severity depend on individual health conditions and other factors.
Advanced Stage: CKD Stage 4
At Stage 4, kidney filtration is severely reduced, and complications may become more common.
Some people may experience:
- Persistent fatigue and weakness
- Fluid retention and swelling
- Nausea or reduced appetite
- Itching
- Sleep disturbances
- Shortness of breath, particularly when fluid accumulates
- Changes in potassium, bicarbonate, or other blood chemistry measurements
These symptoms can have several possible causes. Medical assessment is important to identify whether they are related to CKD or another health condition.
Kidney Failure: CKD Stage 5
Stage 5 CKD involves severely reduced kidney filtration and a greater risk of complications associated with kidney failure.
Possible symptoms include:
- Severe fatigue
- Nausea and vomiting
- Loss of appetite
- Persistent itching
- Swelling caused by fluid retention
- Changes in urination
- Difficulty concentrating or confusion
- Shortness of breath
- Sleep problems
Some people may develop serious complications involving fluid balance, electrolyte levels, or waste buildup in the blood.
Healthcare professionals assess symptoms, laboratory findings, and overall health to determine whether kidney replacement therapy, such as dialysis or transplantation, may be appropriate.
When Should You Seek Medical Attention?
People with known CKD should follow their recommended monitoring schedule and report new or worsening symptoms to their healthcare professionals.
Seek urgent medical attention for warning signs such as severe shortness of breath, chest pain, fainting, or new confusion.
Do not wait for symptoms to appear before checking kidney health. Blood tests and urine tests can identify kidney abnormalities before noticeable symptoms develop.
Remember: Symptoms can provide important clues about health, but they cannot reliably establish CKD stage. Accurate staging requires appropriate kidney function tests, urine assessments, and evaluation of persistent abnormalities.
*Medical references: NIDDK – Symptoms & Causes of Chronic Kidney Disease and National Kidney Foundation – Stages of Chronic Kidney Disease.
How Is Chronic Kidney Disease Managed?
Managing chronic kidney disease involves identifying its underlying cause, monitoring kidney function, controlling contributing health conditions, and reducing the risk of complications.
The appropriate management plan depends on the CKD stage, urine albumin levels, underlying medical conditions, and the individual’s overall health.
There is no single treatment approach that works for everyone.
Although chronic kidney disease cannot always be reversed, appropriate medical care and lifestyle adjustments may help slow its progression and reduce the risk of complications.
1. Regular Kidney Function Monitoring
Routine monitoring helps healthcare professionals evaluate changes in kidney function and identify potential complications.
Common assessments include:
- eGFR: Estimates how efficiently the kidneys filter waste from the blood.
- Urine albumin-to-creatinine ratio (UACR): Measures albumin in the urine to help identify kidney damage.
- Blood pressure: Helps assess cardiovascular and kidney-related risks.
- Blood tests: May evaluate potassium, bicarbonate, hemoglobin, and other measurements depending on the patient’s condition.
The frequency of monitoring depends on CKD severity, albuminuria category, progression risk, and changes in clinical condition.
2. Managing Blood Pressure
Controlling high blood pressure is an important part of CKD management because persistently elevated pressure can contribute to further kidney damage.
Healthcare professionals may recommend lifestyle adjustments and prescribe medications when appropriate.
Common medication groups include:
- ACE inhibitors: May help reduce blood pressure and urine albumin in appropriate patients.
- Angiotensin II receptor blockers (ARBs): May provide similar kidney-protective benefits in selected patients.
These medications are particularly relevant for certain people with CKD and albuminuria. They are not automatically prescribed to everyone with CKD.
3. Managing Blood Glucose Levels
For people with diabetes, maintaining appropriate blood glucose levels can help reduce the risk of diabetic kidney damage and other complications.
Management may involve:
- Regular blood glucose monitoring
- Individualized HbA1c targets
- Appropriate diabetes medications
- Regular kidney function and urine albumin assessments
Some medications, including sodium-glucose cotransporter-2 (SGLT2) inhibitors, may provide kidney and cardiovascular benefits for eligible people with CKD.
Their use depends on clinical indications, kidney function, and other health factors.
4. Following a Kidney-Friendly Eating Pattern
Nutrition can play an important role in managing CKD, but dietary recommendations should be individualized.
Healthcare professionals or registered dietitians may help patients consider:
- Sodium: Reducing excessive salt intake may support blood pressure and fluid management.
- Protein: Avoiding excessive protein intake may be appropriate, but protein needs vary by CKD stage, nutritional status, and individual circumstances.
- Potassium: Restriction is necessary only for some people, depending on blood potassium levels, medications, and other factors.
- Phosphorus: Some patients may need to monitor phosphorus intake, particularly as kidney function declines.
- Overall diet quality: A balanced eating pattern with minimally processed foods can support general health.
A strict renal diet is not automatically necessary for every person with early-stage CKD.
5. Reviewing Medications and Supplements
Some medications and supplements may affect kidney function, especially in people who already have CKD.
For example, nonsteroidal anti-inflammatory drugs (NSAIDs), including ibuprofen and naproxen, can increase the risk of kidney-related complications in certain circumstances.
People with CKD should:
- Review prescription and over-the-counter medications with a healthcare professional.
- Avoid starting supplements without discussing their safety.
- Follow medication doses appropriate for their kidney function.
- Ask whether any medications need adjustment as kidney function changes.
Never stop prescribed medication without medical guidance.
6. Maintaining Healthy Lifestyle Habits
Healthy daily habits can complement medical treatment and support overall cardiovascular and kidney health.
Depending on individual ability and medical advice, these habits may include:
- Engaging in regular physical activity.
- Maintaining a healthy body weight.
- Avoiding smoking.
- Limiting excessive sodium intake.
- Getting adequate sleep.
- Attending scheduled medical appointments.
Physical activity should be adapted to each person’s health status and physical limitations.
7. Planning for Advanced Kidney Disease
For people whose kidney function continues to decline, healthcare professionals may discuss future treatment options before kidney failure develops.
These options may include:
- Hemodialysis: Uses a machine and filter to remove waste and excess fluid from the blood.
- Peritoneal dialysis: Uses the lining of the abdomen to help remove waste and excess fluid.
- Kidney transplantation: Involves receiving a healthy kidney from a living or deceased donor.
- Conservative kidney management: Focuses on symptom control, quality of life, and supportive care without dialysis or transplantation.
Not everyone with CKD will need dialysis or a transplant. Treatment decisions depend on kidney function, symptoms, complications, overall health, and individual preferences.
Why Individualized CKD Management Matters
Chronic kidney disease affects people differently.
Someone with early-stage CKD may primarily need regular monitoring and management of underlying risk factors, while someone with advanced CKD may require more intensive treatment and preparation for kidney replacement therapy.
Working with healthcare professionals helps ensure that monitoring, medication, nutrition, and lifestyle recommendations are appropriate for each person’s needs.
*Medical references: KDIGO 2024 Clinical Practice Guideline for CKD and NIDDK – Managing Chronic Kidney Disease.
Can Chronic Kidney Disease Progress or Improve?
Chronic kidney disease does not progress at the same rate in everyone.
Some people experience little change in kidney function for many years, while others may develop a gradual or more rapid decline.
The progression of CKD depends on several factors, including its underlying cause, urine albumin levels, blood pressure, diabetes management, cardiovascular health, and other medical conditions.
Although established chronic kidney damage cannot always be reversed, appropriate treatment may help slow disease progression, manage complications, and protect remaining kidney function.
Factors That May Influence CKD Progression
Several factors can affect how chronic kidney disease develops over time.
1. Uncontrolled High Blood Pressure
Persistently elevated blood pressure can damage the small blood vessels in the kidneys. Appropriate blood pressure management may help reduce additional kidney stress.
2. Poorly Controlled Diabetes
Consistently high blood glucose levels can contribute to further kidney damage. Managing diabetes with an individualized treatment plan is important for people with diabetic kidney disease.
3. Elevated Urine Albumin Levels
Persistent albumin in the urine can indicate kidney damage. Higher albuminuria categories are generally associated with greater risks of CKD progression and cardiovascular complications.
4. Underlying Kidney Conditions
Some kidney disorders, including inherited conditions and inflammatory diseases, may affect how quickly kidney function changes.
5. Medication and Lifestyle Factors
Certain medications, smoking, excessive sodium intake, and other health-related factors may contribute to kidney or cardiovascular risks.
Reviewing medications and adopting appropriate lifestyle habits can form part of a broader kidney care plan.
Can Kidney Function Improve?
In some circumstances, eGFR may improve after an underlying problem has been addressed.
For example, kidney function measurements may change when dehydration, an acute illness, urinary obstruction, or medication-related effects are treated.
However, an improvement in eGFR does not necessarily mean that established chronic kidney disease has disappeared.
Healthcare professionals evaluate changes in kidney function over time, together with urine albumin levels and other clinical findings, to determine whether kidney health is stable, improving, or worsening.
Does Everyone With CKD Eventually Need Dialysis?
No. Chronic kidney disease does not inevitably progress to kidney failure.
Some people maintain relatively stable kidney function for many years, particularly when contributing conditions are appropriately managed.
Others may experience progressive kidney function loss and eventually require kidney replacement therapy.
The likelihood of progression varies according to factors such as:
- Current eGFR category
- Urine albumin category
- Underlying cause of kidney disease
- Blood pressure and diabetes control
- Age and overall health
- Changes in kidney function over time
Healthcare professionals may use validated risk assessment tools, including the Kidney Failure Risk Equation (KFRE) in appropriate patients, to estimate the likelihood of kidney failure within a specified period.
Why Regular Monitoring Matters
Monitoring kidney function helps identify meaningful changes before serious complications develop.
Depending on individual risk, healthcare professionals may recommend periodic:
- eGFR measurements
- Urine albumin-to-creatinine ratio (UACR) tests
- Blood pressure assessments
- Electrolyte and other blood tests
The frequency of testing should reflect CKD severity, albuminuria, progression risk, and changes in clinical condition.
The key takeaway is that chronic kidney disease does not follow the same course for everyone.
Early identification, appropriate treatment, and regular follow-up can help people make informed decisions and manage their kidney health over time.
Medical references: KDIGO 2024 Clinical Practice Guideline for CKD and National Kidney Foundation – Kidney Failure Risk Equation.
When Should You See a Healthcare Professional?
Kidney disease can develop without noticeable symptoms, especially during its early stages.
For this reason, people with certain risk factors should discuss appropriate kidney screening with their healthcare professionals, even if they feel healthy.
Early evaluation can help identify kidney abnormalities, determine their possible causes, and guide appropriate follow-up care.
1. If You Have Risk Factors for Kidney Disease
Consider discussing kidney screening with a healthcare professional if you have:
- Diabetes
- High blood pressure
- Cardiovascular disease
- A family history of kidney disease
- Previous episodes of acute kidney injury
- A history of certain inherited kidney disorders
Common screening tests include a blood test to estimate eGFR and a urine test to measure the urine albumin-to-creatinine ratio (UACR).
The appropriate testing schedule depends on individual risk factors and medical history.
2. If You Notice Possible Signs of Kidney Problems
Certain symptoms may indicate a kidney-related problem and should be evaluated, particularly if they are persistent or unexplained.
Examples include:
- Persistent swelling in the feet, ankles, hands, or around the eyes
- Repeatedly foamy urine
- Blood in the urine
- Unusual changes in urination patterns
- Persistent fatigue or weakness
- Unexplained nausea or reduced appetite
These symptoms do not necessarily mean someone has CKD. They can occur for many reasons, so medical evaluation is important to identify the underlying cause.
3. If You Have Already Been Diagnosed With CKD
People living with chronic kidney disease should maintain regular follow-up appointments, even when they feel well.
Healthcare professionals may recommend monitoring:
- eGFR and serum creatinine
- Urine albumin levels
- Blood pressure
- Potassium and other electrolytes
- Hemoglobin and other indicators of anemia
- Other measurements based on the CKD stage and individual health needs
Contact your healthcare professional if you notice new or worsening symptoms, changes in medication tolerance, or concerns about your latest test results.
4. Warning Signs That Require Urgent Medical Attention
Some symptoms may indicate a serious medical problem and should not be ignored.
Seek urgent medical attention if you experience:
- Severe or sudden shortness of breath
- Chest pain
- New confusion or a significant change in alertness
- Fainting or loss of consciousness
- Very little or no urine accompanied by other concerning symptoms
- Severe weakness or an irregular heartbeat, particularly if an electrolyte problem is suspected
If symptoms are severe or life-threatening, seek emergency medical care immediately.
Why Early Medical Evaluation Matters
Regular kidney health assessments can help identify abnormalities before noticeable symptoms appear.
They also allow healthcare professionals to monitor changes, manage underlying conditions, and discuss treatment options when needed.
Do not rely on symptoms alone to determine whether your kidneys are healthy or to identify your CKD stage.
Blood tests, urine tests, medical history, and clinical evaluation provide a more reliable assessment.
Medical references: NIDDK – Identify and Evaluate Patients with CKD and National Kidney Foundation – Kidney Disease Symptoms.
FAQ About the Stages of Chronic Kidney Disease
1. What Are the Five Stages of Chronic Kidney Disease?
Chronic kidney disease is commonly divided into five stages based on estimated glomerular filtration rate (eGFR), ranging from Stage 1 to Stage 5.
Stage 1 involves an eGFR of 90 or higher with evidence of kidney damage, while Stage 5 involves an eGFR below 15 and represents kidney failure.
Stages 3 and 4 indicate progressively reduced kidney filtration. However, eGFR is not the only factor used to assess CKD. Urine albumin levels and the underlying cause of kidney damage are also important.
2. Can You Have Kidney Disease Without Symptoms?
Yes. Many people with early-stage CKD do not experience noticeable symptoms.
Kidney damage may be detected through blood tests, such as eGFR, or urine tests, such as the urine albumin-to-creatinine ratio (UACR).
This is why appropriate screening is important for people with risk factors such as diabetes, high blood pressure, or a family history of kidney disease.
3. Does Everyone With Chronic Kidney Disease Eventually Need Dialysis?
No. Not everyone with CKD progresses to kidney failure or requires dialysis.
Some people maintain stable kidney function for many years, while others experience a gradual decline.
The need for dialysis depends on several factors, including symptoms, complications, laboratory results, overall health, and individual treatment decisions. An eGFR below 15 does not automatically mean dialysis must begin immediately.
4. Can Chronic Kidney Disease Be Reversed?
Established chronic kidney disease is not always reversible, particularly when permanent kidney damage has occurred.
However, some factors contributing to reduced kidney function may improve when the underlying problem is treated. For example, dehydration, certain medication effects, or acute kidney problems can temporarily affect eGFR.
Appropriate medical care may help slow CKD progression, manage complications, and preserve remaining kidney function.
5. How Often Should People With CKD Have Their Kidney Function Checked?
The monitoring schedule depends on the CKD stage, urine albumin category, progression risk, and individual medical circumstances.
For many people with CKD, healthcare professionals assess eGFR and urine albumin at least annually. People with higher-risk CKD or changing clinical conditions may need more frequent testing.
Regular follow-up helps identify changes in kidney function and supports timely adjustments to the management plan.
Medical references: KDIGO 2024 Clinical Practice Guideline for CKD and NIDDK – Chronic Kidney Disease.
Conclusion: Understanding the Five Stages of Chronic Kidney Disease
Understanding the five stages of chronic kidney disease can help you make sense of kidney function test results, recognize potential health risks, and take a more informed approach to kidney health.
From Stage 1 to Stage 5, CKD represents different levels of kidney function and disease severity.
However, eGFR is only one part of the assessment. Urine albumin levels, the underlying cause of kidney damage, and changes over time also help healthcare professionals evaluate the condition.
Although chronic kidney disease does not always progress to kidney failure, regular monitoring and appropriate medical care remain important.
Managing conditions such as diabetes and high blood pressure, following individualized dietary recommendations, and reviewing medications can help reduce additional kidney-related risks.
If you or someone you care about has been diagnosed with CKD, learning about the specific stage can be a useful starting point.
Explore our detailed guides to understand each stage, its possible complications, and the management approaches healthcare professionals may recommend.
Remember that every person’s kidney health journey is different.
Work with a qualified healthcare professional to develop a monitoring and treatment plan that reflects your individual needs.
Take the Next Step Toward Better Kidney Health
Understanding the stages of chronic kidney disease is an important step toward making informed decisions about your kidney health.
Whether you are learning about early kidney damage or exploring advanced CKD, understanding your test results, identifying potential risk factors, and following appropriate medical guidance can help you take a more proactive approach.
If you want to explore additional educational information about kidney health, nutrition, and lifestyle approaches, you can also learn more about the Kidney Disease Solution resource.
Explore the Kidney Disease Solution Guide
Remember that educational programs cannot replace medical evaluation, prescribed treatment, or individualized dietary advice.
Discuss supplements and significant dietary changes with your healthcare professional before making changes to your routine.
Affiliate disclosure: We may earn a commission if you purchase through qualifying affiliate links, at no additional cost to you.
Read Next: Explore Each Stage of Chronic Kidney Disease
Want to understand a specific stage of kidney disease in more detail? Explore our individual guides:
- Chronic Kidney Disease Stage 1: Early Signs, Prevention, and Actionable Tips — Learn about early kidney damage, diagnosis, and ways to support kidney health.
- Chronic Kidney Disease Stage 2: Essential Insights and Tips — Understand mild kidney function reduction, monitoring, and lifestyle considerations.
- Chronic Kidney Disease Stage 3: Symptoms, Risks, and Management — Explore moderate kidney function reduction, including the differences between Stage 3a and Stage 3b.
- Chronic Kidney Disease Stage 4: Symptoms, Complications, and Treatment Planning — Learn about severely reduced kidney function and preparation for possible kidney replacement therapy.
- Chronic Kidney Disease Stage 5: Kidney Failure, Dialysis, and Treatment Options — Understand kidney failure and the treatment options healthcare professionals may discuss.
📅 Last updated:
