What is elevated creatinine?

Elevated creatinine is a lab result. It means there is more creatinine than expected in your child’s blood. It is not a disease, but it can be a sign that the kidneys are not filtering waste as well as they should.

Sometimes creatinine rises for a simple reason, such as dehydration. Other times, it can signal a kidney problem that needs medical care. A careful evaluation helps determine the cause.

At Children’s Hospital of Philadelphia (CHOP), pediatric kidney specialists take time to answer your questions and explain results in clear, simple terms. We partner with families at every step.

What is creatinine?

Creatinine is a waste product made when muscles use energy. Kidneys filter creatinine out of the blood, and it leaves the body in urine. 

Doctors measure creatinine with a blood test to check kidney function.

“Normal” levels vary by age, body size, muscle mass and hydration. Babies and young children have lower levels than teens because they have less muscle. After your child has a blood test, the laboratory reports a creatinine number. Your child’s doctor compares that blood creatinine level to age-based ranges for children. Your child’s doctor may also calculate the estimated glomerular filtration rate (eGFR). The eGFR shows how well the kidneys clean the blood. Your child’s care team will walk you through what these numbers mean and how they guide next steps.

What causes high creatinine levels?

Many factors can raise creatinine levels. Some are temporary. Others need ongoing care.

Common causes include:

• Dehydration: Not drinking enough fluids can raise creatinine.
• Acute kidney injury (AKI): A sudden drop in kidney function. It can happen with severe dehydration, infection, certain medicines or after surgery.
• Chronic kidney disease (CKD): Long-term kidney damage. Creatinine may stay high over time. 
• Kidney infections: Infections can affect how the kidneys filter waste.
• Urinary tract blockages: A blockage can keep urine from draining.
• Certain medications: Some medicines can affect kidney function.
• Muscle injury or rapid muscle breakdown: This increases creatinine production.

Finding the cause is the most important step. Once we understand why creatinine is elevated, we can focus on the right treatment and help your child feel better. Many children improve once the underlying issue is treated.

What are the signs and symptoms of elevated creatinine?

Some children have no symptoms, and doctors incidentally find elevated creatinine during routine blood tests. 

When symptoms occur, they may include:

• Swelling in the face, hands, belly or legs
• Changes in how often your child urinates
• Very dark or foamy urine
• Fatigue or low energy
• Loss of appetite
• Nausea or vomiting
• High blood pressure

These symptoms can have many causes. Proper testing is essential to understand what is happening. 

How do you test for and diagnose high creatinine levels?

Doctors use several tools to evaluate kidney function and find the cause:

• Blood tests: A blood test measures creatinine. Doctors often calculate the eGFR to estimate how well the kidneys filter waste. In some cases, additional markers such as cystatin C may provide more detail.
• Urine tests: Urine testing checks for protein, blood, infection or abnormal creatinine levels. A urine protein-to-creatinine ratio can help measure how much protein the kidneys are leaking.
• Blood pressure measurement: High blood pressure can both cause and result from kidney disease, so careful monitoring is important.
• Imaging tests: Ultrasound or other imaging shows kidney size, structure and possible blockages.
• Medical history and exam: Doctors review medicines, recent illness, hydration and family history.

At CHOP, pediatric nephrologists interpret results using age-specific standards. Our team works closely with specialists in urology, cardiology, genetics and transplant when needed. We coordinate care so your child receives the right expertise at the right time.

What are the treatment options for elevated creatinine?

Treatment depends on the cause. The goal is to restore or protect kidney function.

Hydration and supportive care

If dehydration is the cause, increasing fluids may return creatinine to normal. Some children need intravenous (IV) fluids in the hospital. Many children respond quickly once they are rehydrated.

Medication review and treatment of underlying causes

If a medicine affects kidney function, doctors may adjust the dose or switch to a safer option. Infections may need antibiotics or antiviral treatment.

Care for acute kidney injury

Children with AKI may need hospital care and close monitoring. Doctors track urine output, blood pressure and lab values to guide recovery. In many cases, kidney function improves with careful support. 

Management of chronic kidney disease

If your child has CKD, treatment focuses on slowing progression and supporting healthy growth. Care may include:

• Medicines to control blood pressure
• Medicines to reduce swelling
• Medicines to minimize protein in the urine
• Nutrition guidance tailored to kidney health
• Ongoing lab monitoring

In severe cases, advanced treatments such as dialysis or kidney transplant may be necessary. CHOP offers comprehensive pediatric dialysis and transplant services when needed. Our team supports families at every stage, from early monitoring to advanced care.

What follow-up care is needed for elevated creatinine?

Follow‑up helps ensure that creatinine levels improve or stay stable. 

Your child may need:

• Repeat blood and urine tests
• Regular blood pressure checks
• Monitoring of growth and nutrition
• Ongoing visits with a pediatric nephrologist

Children with temporary causes often return to normal kidney function. Children with long-term kidney conditions benefit from early, specialized care. Regular follow-up visits give you time to ask questions and stay informed about your child’s progress.

What is the long-term outlook for children with high creatinine levels?

The outlook depends on the cause. If creatinine rises because of dehydration, infection or a medicine effect, kidney function often returns to normal once the problem is treated. 

If a child has chronic kidney disease, early diagnosis and expert management can protect kidney function and support healthy development. Many children with kidney conditions live active, full lives with proper care. 

At CHOP, our team looks beyond lab results to your child’s overall health, growth and quality of life. We partner with families to guide each step forward.