The kidneys continuously filter the blood to remove waste products and excess fluid while maintaining the body's balance of water, electrolytes, acids, and other substances. When the kidneys are not filtering properly, waste and fluid may begin to accumulate, and abnormalities may develop in blood and urine tests.
Reduced kidney filtration can occur suddenly because of Acute Kidney Injury (AKI) or develop gradually as Chronic Kidney Disease (CKD). The symptoms and treatment depend on the underlying cause and the degree of kidney dysfunction.
Some people with reduced kidney function have no obvious symptoms, particularly during the early stages. This is why blood and urine testing can be important for people who have risk factors such as diabetes, high blood pressure, or a history of kidney disease.
At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, a super specialist nephrologist, provides comprehensive kidney evaluation, kidney function testing, diagnosis, personalized treatment, and long-term kidney care.
What Does It Mean When the Kidneys Are Not Filtering Properly?
When kidney filtration declines, the kidneys may become less effective at:
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Removing waste products from the blood
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Eliminating excess fluid
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Maintaining electrolyte balance
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Regulating acid-base balance
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Helping control blood pressure
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Supporting red blood cell production
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Maintaining healthy mineral and bone metabolism
The severity can range from a temporary reduction in kidney function to advanced and potentially irreversible kidney failure.
Importantly, poor kidney filtration does not automatically mean kidney failure. The cause, duration, and degree of kidney dysfunction need to be established.
Signs That Your Kidneys May Not Be Filtering Properly
Symptoms vary considerably between individuals.
Changes in Urination
Changes may include:
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Reduced urine output
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More frequent urination
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Increased urination at night
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Foamy urine
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Blood in the urine
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Dark or unusually concentrated urine
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Difficulty passing urine
Urinary changes should be evaluated, especially when they persist or occur with other symptoms.
Swelling
When the kidneys cannot adequately remove sodium and water, fluid can accumulate in the tissues.
Swelling may occur around:
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Feet
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Ankles
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Legs
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Hands
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Face
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Eyelids
Persistent swelling can have many causes, so it should not automatically be attributed to kidney disease.
Persistent Fatigue
Reduced kidney function may contribute to tiredness through waste accumulation, anemia, sleep problems, or other complications.
Some patients may notice:
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Weakness
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Reduced stamina
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Difficulty concentrating
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Increased tiredness
Nausea and Poor Appetite
More advanced kidney dysfunction can cause waste products to accumulate in the bloodstream.
Possible symptoms include:
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Nausea
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Vomiting
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Poor appetite
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Metallic taste
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Unintentional weight loss
Itchy or Dry Skin
Persistent itching may occur in people with advanced CKD and can be associated with dry skin, mineral disturbances, inflammation, and other factors.
Muscle Cramps
Electrolyte or mineral abnormalities associated with kidney disease may contribute to muscle cramps.
Shortness of Breath
Breathlessness may occur when excess fluid accumulates or when anemia and other complications develop.
Shortness of breath can have many causes and may require urgent evaluation depending on severity.
High Blood Pressure
Kidney disease and high blood pressure are closely connected.
Reduced kidney function can contribute to elevated blood pressure, while uncontrolled hypertension can further damage the kidneys.
What Causes the Kidneys to Stop Filtering Properly?
There are many possible causes.
Chronic Kidney Disease
CKD develops gradually and may result from:
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Diabetes
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High blood pressure
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Glomerular diseases
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Polycystic kidney disease
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Autoimmune kidney disorders
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Long-standing urinary tract problems
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Other chronic kidney conditions
Acute Kidney Injury
AKI can cause a sudden decrease in kidney filtration.
Possible causes include:
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Severe dehydration
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Significant blood loss
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Low blood pressure
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Severe infection
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Certain medications
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Kidney inflammation
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Urinary obstruction
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Reduced blood flow to the kidneys
Some cases of AKI improve substantially when the underlying cause is identified and treated promptly.
Diabetes
Long-standing or poorly controlled diabetes can damage the kidney's filtering units.
Diabetic kidney disease may initially cause few symptoms, which makes regular screening particularly important in people with diabetes.
High Blood Pressure
Persistent hypertension can damage the blood vessels and filtering structures of the kidneys.
Controlling blood pressure is therefore an important part of protecting kidney function.
Kidney Stones and Urinary Obstruction
A stone or other blockage can interfere with urine drainage.
Significant or prolonged obstruction may cause hydronephrosis and potentially affect kidney function.
Kidney Infections
Severe or recurrent kidney infections can affect kidney health, particularly when associated with obstruction or other underlying abnormalities.
How Do Doctors Know If the Kidneys Are Filtering Properly?
Symptoms alone cannot accurately measure kidney filtration.
Doctors commonly use blood and urine tests along with the patient's medical history and imaging when necessary.
Serum Creatinine
Creatinine is a waste product that is normally removed from the bloodstream by the kidneys.
When kidney filtration decreases, blood creatinine may rise.
However, a high creatinine level does not by itself establish the exact cause or severity of kidney disease.
eGFR
The estimated Glomerular Filtration Rate (eGFR) is commonly used to estimate kidney filtration.
A persistently reduced eGFR can indicate impaired kidney function.
The result should be interpreted alongside:
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Age
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Clinical condition
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Previous kidney test results
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Urine findings
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Underlying disease
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Other laboratory results
A single abnormal eGFR does not necessarily establish chronic kidney disease because acute illness can temporarily change kidney function.
Urine Albumin and Protein Testing
Urine testing can identify protein or albumin leakage.
The Albumin-to-Creatinine Ratio (ACR) can provide important information about kidney damage and cardiovascular risk.
Electrolyte Testing
Kidney dysfunction can affect levels of substances such as:
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Potassium
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Sodium
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Bicarbonate
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Calcium
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Phosphorus
These abnormalities may require treatment depending on their severity.
Imaging
Depending on the suspected cause, the doctor may recommend:
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Kidney ultrasound
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CT scan
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Other imaging when clinically indicated
Imaging can help identify kidney stones, obstruction, cysts, structural abnormalities, or changes in kidney size.
Understanding Kidney Function Stages
When CKD is confirmed and appropriately classified, eGFR helps determine the stage.
| CKD Category | eGFR |
|---|---|
| G1 | 90 or higher with evidence of kidney damage |
| G2 | 60–89 with evidence of kidney damage |
| G3a | 45–59 |
| G3b | 30–44 |
| G4 | 15–29 |
| G5 | Below 15 |
Stage 1 and Stage 2 CKD require evidence of kidney damage and persistence for at least three months; eGFR alone is not sufficient.
Similarly, a low eGFR should be interpreted in context rather than treated as a simple percentage of kidney function.
Can Kidneys Start Filtering Normally Again?
This depends on the cause.
Acute Kidney Injury
Kidney filtration can improve, sometimes substantially, when the underlying cause is treated.
For example, kidney function may improve after appropriate treatment of:
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Dehydration
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Infection
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Low blood pressure
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Medication-related kidney injury
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Urinary obstruction
Recovery can be complete or partial depending on the severity and duration of the injury.
Chronic Kidney Disease
Established CKD is generally not completely reversible. However, appropriate treatment can often slow progression and stabilize kidney function.
Early diagnosis is therefore important.
Treatment When Kidneys Are Not Filtering Properly
Treatment is directed toward the underlying cause and complications.
Treat the Underlying Disease
Management may include:
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Controlling diabetes
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Managing high blood pressure
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Treating infections
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Relieving urinary obstruction
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Treating inflammatory kidney diseases
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Reviewing potentially harmful medications
Blood Pressure Management
Good blood pressure control can help protect remaining kidney function.
The choice of medication depends on the patient's kidney function, urine protein levels, potassium, blood pressure, and other medical factors.
Diabetes Management
Good blood glucose control can reduce the risk of ongoing diabetic kidney damage.
Patients with diabetes should follow their individualized treatment and kidney-monitoring plan.
Managing Protein in the Urine
When significant albumin or protein leakage is present, appropriate kidney-protective medications may be considered.
Treatment should be individualized according to kidney function and other laboratory findings.
Managing Anemia and Mineral Abnormalities
Advanced CKD may cause complications such as:
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Anemia
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Abnormal calcium and phosphorus levels
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Metabolic acidosis
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Electrolyte disturbances
These problems may require medications, dietary adjustments, or other treatments.
When Is Dialysis Needed?
Poor kidney filtration does not automatically mean that dialysis is required.
Dialysis is generally considered when kidney function is severely impaired and complications cannot be adequately controlled with other treatments.
Possible reasons include:
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Severe or persistent fluid overload
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Dangerous potassium abnormalities
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Severe metabolic acidosis
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Significant uremic symptoms
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Certain toxin or waste accumulation
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Progressive nutritional deterioration
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Other serious complications
The decision is based on the patient's overall clinical condition rather than creatinine or eGFR alone.
Kidney Transplant as a Treatment Option
For eligible patients with advanced irreversible kidney failure, kidney transplantation may provide an alternative to long-term dialysis.
Evaluation may include:
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Overall health assessment
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Kidney function
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Cardiovascular evaluation
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Infection screening
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Blood group and immune compatibility testing
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Donor assessment
Long-term follow-up and medication adherence are essential after transplantation.
Lifestyle Measures to Support Kidney Health
Patients with reduced kidney function can support their health by:
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Controlling blood pressure
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Managing diabetes
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Reducing excessive salt intake
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Maintaining a healthy weight
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Staying physically active as medically appropriate
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Avoiding unnecessary NSAID painkillers
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Avoiding unverified herbal or "kidney cleansing" products
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Taking prescribed medicines correctly
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Attending regular kidney follow-ups
Fluid intake should be individualized. Drinking excessive amounts of water is not appropriate for every person with kidney disease, particularly those with fluid overload or certain types of urinary obstruction.
Foods and Diet When Kidneys Are Not Filtering Properly
There is no single kidney diet that is appropriate for everyone.
Depending on kidney function and laboratory results, a nephrologist or renal dietitian may recommend adjustments to:
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Sodium
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Protein
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Potassium
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Phosphorus
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Fluid
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Overall calorie intake
Dietary restrictions should be personalized rather than based on generic online lists.
Warning Signs That Need Urgent Medical Attention
Seek urgent medical care if reduced kidney function is accompanied by:
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Very low or absent urine output
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Severe breathlessness
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Chest pain
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Severe swelling
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Persistent vomiting
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Confusion or marked drowsiness
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Severe weakness
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High fever with urinary symptoms
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Severe flank pain with fever or chills
These symptoms can indicate serious complications and should not be managed with home remedies alone.
Kidney Function Evaluation at Prabhakar Bhurke Clinic
At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, a super specialist nephrologist, provides comprehensive evaluation for patients with suspected or confirmed reduced kidney function.
Assessment may include:
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Detailed medical history
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Physical examination
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Blood pressure evaluation
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Serum creatinine and eGFR
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Urine analysis and albumin testing
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Electrolyte evaluation
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Kidney imaging when indicated
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Assessment of diabetes and hypertension
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Evaluation for kidney stones or urinary obstruction
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Long-term CKD monitoring
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Dialysis planning when medically necessary
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Kidney transplant evaluation and guidance
The goal is to identify why kidney filtration is reduced and develop an individualized plan to protect remaining kidney function.
Frequently Asked Questions
What happens when kidneys are not filtering properly?
Waste products and excess fluid may accumulate, while electrolyte and acid-base balance can become abnormal. Depending on the severity, patients may develop swelling, fatigue, changes in urination, nausea, itching, cramps, breathlessness, or other complications.
Does high creatinine mean my kidneys have stopped working?
No. High creatinine can indicate reduced kidney filtration, but it does not automatically mean complete kidney failure. The cause, eGFR, previous results, urine tests, and clinical condition need to be evaluated.
Can poor kidney filtration be reversed?
AKI can sometimes improve substantially when its cause is treated. Established CKD is generally not reversible, but appropriate treatment can slow progression and sometimes stabilize kidney function.
How can I improve kidney filtration?
There is no single medicine or home remedy that improves filtration in everyone. Treatment depends on the cause. Controlling blood pressure and diabetes, treating obstruction or infection, reviewing medications, and managing kidney complications can help protect kidney function.
Can drinking more water improve kidney filtration?
Not necessarily. Fluid requirements depend on the individual's kidney function, urine output, heart health, and other conditions. Excessive water intake can be harmful in some situations.
Can herbal medicines improve kidney function?
There is no universally proven herbal treatment that safely restores kidney filtration. Some herbal products may contain nephrotoxic or undisclosed ingredients and can interact with medications.
When does poor kidney function require dialysis?
Dialysis may be needed in severe kidney dysfunction when complications such as refractory fluid overload, dangerous electrolyte abnormalities, severe acidosis, or significant uremic symptoms cannot be adequately managed otherwise.
Which doctor should I consult if my kidneys are not filtering properly?
A nephrologist specializes in diagnosing and treating kidney diseases and evaluating reduced kidney function. A urologist may also be involved when a structural problem such as a stone or urinary obstruction requires a procedure.
Conclusion
When the kidneys are not filtering properly, waste products and excess fluid may accumulate, and important electrolyte and metabolic abnormalities can develop. However, reduced kidney filtration can have many causes, and it does not automatically mean irreversible kidney failure.
Early evaluation using creatinine, eGFR, urine testing, blood tests, and imaging when appropriate can help identify the underlying problem. Acute kidney injury may improve when treated promptly, while established chronic kidney disease can often be managed to slow further decline.
At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, a super specialist nephrologist, provides comprehensive kidney function assessment, diagnosis, personalized treatment, CKD management, dialysis planning, transplant evaluation, and long-term kidney care.
Book an Appointment Today
If you have high creatinine, reduced eGFR, swelling, changes in urination, foamy urine, blood in the urine, persistent fatigue, nausea, abnormal kidney tests, or other signs of reduced kidney function, schedule a consultation at Prabhakar Bhurke Clinic.
Dr. Sandip Prabhakar Bhurke, a super specialist nephrologist, can evaluate your kidney function, identify possible causes of reduced filtration, and develop an individualized plan to protect your kidney health.
Medical Disclaimer
This article is intended for general educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Kidney function abnormalities can have different causes and require individualized evaluation. Do not self-medicate, take unverified herbal products, or force excessive fluids in an attempt to improve kidney filtration. Seek urgent medical attention for very low or absent urine output, severe breathlessness, chest pain, confusion, persistent vomiting, or severe pain with fever or chills.
