What can high creatinine mean?
A higher-than-expected level can indicate that the kidneys are not filtering waste as efficiently as expected. However, it does not confirm kidney disease on its own.
Kidney Function Test: What Do Creatinine and eGFR Mean?
Kidney Function Test: What Do Creatinine and eGFR Mean?
A kidney function test can help assess how well your kidneys remove waste from your blood. Learn what creatinine and eGFR mean, how results are interpreted, and when a healthcare professional may recommend further testing.
Explore Health ScreeningQuick Answer: What Do Creatinine and eGFR Tell You?
Creatinine is a waste product from normal muscle activity that is removed from the blood by the kidneys. A blood creatinine test measures how much is present. eGFR (estimated glomerular filtration rate) uses creatinine and other factors, such as age and sex, to estimate how well the kidneys filter blood. A higher eGFR generally indicates better filtering, but results must be interpreted alongside your medical history and, when appropriate, urine tests.
Understand Your Health
What Do Your Kidneys Do?
Your kidneys filter waste and excess fluid from your blood and remove them through urine. They also help maintain the balance of fluids and minerals in the body and play a role in blood pressure regulation and red blood cell production.
Kidney problems may develop without obvious symptoms in the early stages. A suitable kidney function test can help identify certain changes, especially for people with risk factors such as diabetes or high blood pressure.
Why Kidney Function Tests Matter
Blood and urine tests provide different information about kidney health. When interpreted together and in context, they can help a healthcare professional decide whether monitoring or further assessment is needed.
Blood Test Explained
What Is Creatinine in a Kidney Function Test?
Creatinine is a waste product produced as muscles use energy. The kidneys normally filter it out of the blood, and it leaves the body in urine. A serum creatinine test measures the amount of creatinine in a blood sample.
What else affects creatinine?
Age, muscle mass, recent intense exercise, diet, certain supplements, medicines and hydration status can influence the result. Your clinician will consider these factors when interpreting it.
Creatinine reference ranges can differ between laboratories and individuals. It is usually more informative to review creatinine alongside eGFR and previous results than to interpret one number in isolation.
Understanding Your Results
What Is eGFR and Why Is It Important?
eGFR stands for estimated glomerular filtration rate. It estimates how effectively the kidneys filter waste from the blood. It is commonly calculated using blood creatinine and factors such as age and sex; some situations may call for additional tests such as cystatin C.
Higher eGFR
A higher value generally suggests better filtering. An eGFR of 90 or above is often within the expected range, but other findings—such as protein in the urine—can still indicate kidney damage.
Lower eGFR
A lower value may indicate reduced kidney filtering. The result needs to be assessed in context, and a repeat test may be needed to understand whether the change is temporary or persistent.
eGFR is an estimate, not a direct measurement of kidney function. It may be less accurate in some circumstances, including unusual muscle mass, pregnancy or certain medical conditions. Ask your healthcare professional what your result means for you.
Result Guide
How Are Kidney Function Test Results Interpreted?
The following adult eGFR ranges are a general guide, not a diagnosis. Your clinician will consider the result alongside urine tests, medical history and whether the finding persists over time.
eGFR 90 or above
Often within the expected range. Kidney damage may still be present if other markers, such as urine albumin, are abnormal.
eGFR 60–89
May reflect mildly reduced filtering. This number alone does not establish chronic kidney disease; other evidence and the duration of the finding matter.
eGFR 30–59
Indicates a more substantial reduction in estimated filtering and should be reviewed by a healthcare professional.
eGFR below 30
Indicates severely reduced estimated filtering and requires prompt medical follow-up to determine the cause and appropriate care.
Important: Chronic kidney disease is generally identified by kidney abnormalities that persist for at least three months. A single eGFR result does not always show whether a problem is chronic or temporary. An eGFR below 15 is severely reduced and needs urgent clinical assessment; interpretation and next steps depend on the whole clinical picture.
A More Complete Picture
What Other Tests May Be Used to Check Kidney Health?
Creatinine and eGFR are important, but they do not provide every detail about kidney health. Depending on your risk factors and results, your healthcare professional may recommend additional tests.
Urine Albumin-to-Creatinine Ratio (uACR)
This urine test checks for albumin, a protein that may leak into urine when kidney filters are damaged. It can identify signs of kidney damage even when eGFR is relatively preserved.
Urinalysis
A urine sample may be checked for blood, protein and other findings that can help assess possible kidney or urinary tract problems.
Urea and Electrolytes
Selected blood tests may assess waste products and minerals such as potassium and sodium. The tests ordered depend on your clinical situation.
Blood Pressure and Blood Sugar
These measurements help assess important kidney disease risk factors. Managing high blood pressure and diabetes can help protect kidney health.
Not everyone needs every test. A healthcare professional can advise which investigations are suitable for your age, medical history and risk profile.
Know Your Risk
Who Should Consider a Kidney Function Test?
A kidney function test may be recommended as part of routine monitoring or when a person has symptoms or risk factors associated with kidney problems.
- People living with diabetes or high blood pressure.
- People with a family history of kidney disease or known kidney problems.
- Individuals with cardiovascular disease or other conditions that may affect kidney health.
- People taking medicines that may affect kidney function, when monitoring is advised by their clinician.
- People with symptoms such as swelling, changes in urination or persistent unexplained fatigue.
- Anyone whose healthcare professional recommends testing based on their medical history or previous results.
Symptoms such as swelling or changes in urination can have several causes. Seek medical advice rather than relying on a screening test alone, particularly if symptoms are new, severe or worsening.
Before Your Appointment
How to Prepare for a Kidney Function Test
A kidney function test usually involves a blood sample, and additional urine testing may be requested. Preparation depends on the tests included.
- Ask whether fasting is required. Creatinine testing alone does not always require fasting, but other tests in the same package may have different instructions.
- Tell the team about medicines and supplements. Do not stop prescribed medication unless your healthcare professional tells you to.
- Follow hydration instructions. Drink fluids as advised and tell the team if you have been unwell or may be dehydrated.
- Share relevant history. Mention kidney conditions, diabetes, high blood pressure and recent illness or intense exercise if relevant.
- Bring previous results if available. Comparing results over time can help your clinician assess changes.
Local Health Screening
Looking for a Kidney Function Test in Johor Bahru?
If you are looking for a kidney function test in Johor Bahru, compare health screening packages carefully to see whether serum creatinine, eGFR, urine testing or other relevant investigations are included. Package inclusions can vary.
Southern Health Centre provides health screening services for people who want to review selected aspects of their health. Before booking, confirm the available tests, preparation instructions and how results are reviewed.
What to Check Before Booking
- Whether creatinine and eGFR are included in the selected package.
- Whether urine albumin or urinalysis is available if clinically appropriate.
- Whether fasting is required for any tests in the package.
- How and when results will be explained.
- Whether follow-up consultation is available if a result is abnormal.
Review the available health screening packages in Johor Bahru and contact the centre to confirm the current test inclusions.
Understand Your Kidney Health
Creatinine and eGFR provide useful information about kidney filtering, but results should be interpreted in context. Ask a healthcare professional which tests are appropriate for your health needs and risk factors.
View Health Screening Packages Visit Southern Health CentreFrequently Asked Questions
Kidney Function Test FAQs
What is included in a kidney function test?
It may include a blood test for creatinine and a calculated eGFR. Depending on your health needs, a clinician may also recommend urine albumin-to-creatinine ratio, urinalysis, urea or electrolyte tests. Inclusions vary by package.
What is a normal creatinine level?
Creatinine reference ranges vary by laboratory and can depend on factors such as age, sex and muscle mass. Check the reference range on your report and ask a healthcare professional to interpret the result alongside your eGFR and medical history.
What is a normal eGFR?
An eGFR of 90 or above is often within the expected range for adults. However, kidney damage may still be present if other findings, such as albumin in the urine, are abnormal. eGFR also tends to decrease with age, so results need individual interpretation.
Is high creatinine always a sign of kidney disease?
No. High creatinine can be associated with reduced kidney function, but factors such as muscle mass, recent strenuous exercise, diet, dehydration, supplements and some medicines can also affect it. Your clinician may review eGFR and other tests before drawing conclusions.
Can I have kidney disease with normal creatinine?
Yes. Creatinine alone may not identify every case of early kidney disease. eGFR and urine tests such as uACR can provide additional information. Your healthcare professional can advise which tests are appropriate for you.
What eGFR level is concerning?
An eGFR below 60 may indicate reduced kidney function, especially if it persists for at least three months or is accompanied by other signs of kidney damage. An eGFR below 30 indicates a more severe reduction and needs medical review. A single result must be interpreted in context.
Do I need to fast before a kidney function blood test?
Not always. A creatinine test alone may not require fasting, but other tests included in your screening package may. Follow the instructions from your screening centre and do not stop prescribed medication unless instructed by your healthcare professional.
How often should I check my kidney function?
The frequency depends on your health, risk factors, previous results and any existing kidney condition. People with diabetes, high blood pressure or known kidney disease may need regular monitoring. Ask your clinician how often you should be tested.
Where can I get a kidney function test in Johor Bahru?
You can review the health screening options listed by Southern Health Centre on its health screening packages page. Contact the centre to confirm whether creatinine, eGFR and any other tests you need are included.
14 Oct 2026
CONTACT US
Letβs Take the Next Step
Towards Better Health
Have questions about our health screening programmes or medical services? Get in touch with our team for more information or to arrange your appointment.
We would love to hear from you.
Please feel free to contact us for any enquiry.