High Creatinine Levels: Normal Range and Management

Creatinine is a byproduct of normal muscle metabolism that is primarily filtered out of the body by the kidneys through urine. Creatinine levels are one of the key markers used to assess kidney function. When creatinine is higher than expected, it may indicate impaired kidney function or other underlying health concerns. So what can you do if your creatinine is high, and what is the normal range? This article answers these questions and offers practical health advice to help you manage your creatinine levels and look after your kidneys.

What Is Creatinine and What Role Does It Play in Our Body?

Creatinine is a metabolic waste product generated by the normal breakdown of muscle tissue and the digestion of dietary protein. When your muscles are active, creatine is broken down into creatinine, which then travels through the bloodstream to the kidneys and is excreted in the urine. Because the body produces creatinine at a relatively steady rate, its level in the blood serves as a reliable indicator of how well your kidneys are filtering waste, making it an essential marker in kidney function assessments.

Normal Blood Creatinine Ranges

Creatinine levels vary depending on age, sex and muscle mass. The following are general reference ranges:

Age and Gender	Normal creatinine level (umol/L)
Adult females and those assigned female at birth	49-90 umol/L
Adult males and those assigned male at birth	65-104 umol/L

Please note: Reference ranges may differ slightly between laboratories. Always refer to the values provided on your own test report.

Common Causes of High Creatinine

Elevated creatinine (hypercreatininaemia) can result from several factors:

1. Impaired kidney function

Kidney infections, rhabdomyolysis (abnormal muscle breakdown) and urinary tract obstruction can all lead to a rise in creatinine levels.

2. High-protein diet

Consuming large amounts of meat may cause a temporary spike in serum creatinine.

3. Medication effects

Certain medications, such as cimetidine (brand name Tagamet) and the antibiotic co-trimoxazole (brand name Bactrim), can sometimes cause an abnormal rise in creatinine levels.

Drugs that damage the kidneys directly or indirectly, including aminoglycoside antibiotics, non-steroidal anti-inflammatory drugs (NSAIDs), angiotensin-converting enzyme (ACE) inhibitors and contrast agents, may also push creatinine levels up.

4. Other medical conditions

Underlying conditions such as dehydration, diabetes, high blood pressure or heart failure can indirectly affect kidney function and lead to elevated creatinine.

What symptoms are associated with high creatinine on a blood test?

The symptoms of impaired kidney function (renal insufficiency) vary from person to person and do not always correlate directly with blood creatinine levels. There are usually no symptoms in mild kidney impairment. Common symptoms found in severe kidney impairment include:

Fatigue
Loss of appetite
Difficulty sleeping
Increased or decreased urine output
Swelling (oedema)
Shortness of breath
Difficulty concentrating or confusion
Nausea and vomiting
Neuropathy
Dry skin

If you experience any of these symptoms, it is advisable to seek medical assessment early to safeguard your kidney health.

How to improve high creatinine levels

1. Adjust your diet

Reduce animal protein: Cut back on red meat, organ meats and dairy products, choose plant-based protein, such as legumes, nuts and seeds.
Avoid routine potassium restriction: Do not restrict potassium intake unless a blood test confirms a high level of potassium. Choose low-potassium foods: Opt for a diet rich in fruits, vegetables, and wholegrains.
Limit sodium: Low sodium intake (less than 2 grams a day) supports blood pressure control and fluid balance.

2. Adopt healthier lifestyle habits

Exercise regularly: Choose low-to-moderate-intensity activities such as walking or yoga.
Avoid creatine supplements: This can elevate your creatinine level, which may be misinterpreted as a kidney problem. This is especially important if your kidney function is already compromised.
Limit alcohol intake.

3. Have regular check-ups

Routine kidney function tests and urine tests can help detect abnormal creatinine levels and kidney impairment early, and allow any underlying condition to be managed promptly.

4. Manage underlying conditions

If elevated creatinine is linked to diabetes, high blood pressure or another condition, actively managing that condition can help bring creatinine levels under control.

5. Be aware of medication side effects

Understand the safety profile of your medications, particularly if you are taking several drugs for different conditions. Speak with your GP to review your medications regularly.

6. Consult your doctor

If your creatinine levels remain persistently elevated, seek medical advice early so that a personalised treatment plan can be put in place.

OT&P’s Professional Health Services

Abnormal creatinine levels can be an early warning sign of underlying kidney problems, and timely action is important. You can book one of OT&P’s comprehensive health check plans or a standalone kidney function assessment. Our medical team will review your results and tailor a health management plan to help you control your creatinine levels and support your kidney health.

If you have questions or would like to learn more, book an appointment with one of our GPs or contact OT&P to arrange a health screening.

Dr Shiba Poon

General Practice, Family Medicine

LMCHK
MBBS (Lond)
DRCOG
DCH (RCPCH)
PGDipClinDerm (Lond)
MRCGP
Honorary Clinical Assistant Professor In Family Medicine (HKU)

View Profile

Health Articles by Dr Shiba Poon

References

Alberta Health Services (2021) Nutrition Guideline: Renal. Edmonton: Alberta Health Services. Available at: https://www.albertahealthservices.ca/assets/info/nutrition/if-nfs-ng-renal.pdf (Accessed: 20 July 2026).
American Academy of Family Physicians (2023) 'Chronic Kidney Disease: Prevention, Diagnosis, and Treatment', American Family Physician, 108(6). Available at: https://www.aafp.org/afp/2023/1200/chronic-kidney-disease (Accessed: 20 July 2026).
Andreev, E., Koopman, M. and Arisz, L. (1999) 'A rise in plasma creatinine that is not a sign of renal failure: which drugs can be responsible?', Journal of Internal Medicine, 246(3), pp. 247–252. DOI: 10.1046/j.1365-2796.1999.00515.x. Available at: https://onlinelibrary.wiley.com/doi/full/10.1046/j.1365-2796.1999.00515.x (Accessed: 20 July 2026).
Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group (2024) 'KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease', Kidney International, 105(4S), pp. S117–S314. DOI: 10.1016/j.kint.2023.10.018. Available at: https://pubmed.ncbi.nlm.nih.gov/38490803 (Accessed: 20 July 2026).
Kim, S.M. and Jung, J.Y. (2020) 'Nutritional management in patients with chronic kidney disease', The Korean Journal of Internal Medicine, 35(6), pp. 1279–1290. DOI: 10.3904/kjim.2020.408. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC7652660 (Accessed: 20 July 2026).
Neale, E.P., Do Rosario, V., Probst, Y., Beck, E., Tran, T.B. and Lambert, K. (2023) 'Lifestyle Interventions, Kidney Disease Progression, and Quality of Life: A Systematic Review and Meta-analysis', Kidney Medicine, 5, p. 100643. DOI: 10.1016/j.xkme.2023.100643. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC10205767 (Accessed: 20 July 2026).
Rangaswami, J., Bhalla, V., Blair, J.E.A., Chang, T.I., Costa, S., Lentine, K.L., Lerma, E.V., Mezue, K., Molitch, M., Mullens, W., Ronco, C., Tang, W.H.W. and McCullough, P.A. (2019) 'Cardiorenal Syndrome: Classification, Pathophysiology, Diagnosis, and Treatment Strategies', Circulation, 139(16), pp. 840–878. DOI: 10.1161/CIR.0000000000000664. Available at: https://www.ahajournals.org/doi/10.1161/CIR.0000000000000664 (Accessed: 20 July 2026).
UK Kidney Association (n.d.) Assessment of patients with a new diagnosis of CKD: UK eCKD Guide. Available at: https://www.ukkidney.org/health-professionals/information-resources/uk-eckd-guide/assessment-patients-new-diagnosis-ckd (Accessed: 20 July 2026).
U.S. Department of Veterans Affairs and Department of Defense (2025) VA/DoD Clinical Practice Guideline for the Management of Chronic Kidney Disease. Washington, DC: Department of Veterans Affairs. Available at: https://www.healthquality.va.gov/guidelines/CD/ckd/CKD-CPG_2025-Guideline_final_20250509.pdf (Accessed: 20 July 2026).
Waheed, S. and Bhatt, H. (2023) 'Uremia', in StatPearls [Online]. Treasure Island (FL): StatPearls Publishing. Available at: https://www.ncbi.nlm.nih.gov/books/NBK441859 (Accessed: 20 July 2026).
Williamson, L. and New, D. (2014) 'How the use of creatine supplements can elevate serum creatinine in the absence of underlying kidney pathology', BMJ Case Reports, 2014, p. bcr2014204754. DOI: 10.1136/bcr-2014-204754. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC4170516 (Accessed: 20 July 2026).
Xu, X., Zeng, T., Chen, S., Tian, N., Zhang, C., Chen, Y., Deng, S., Mao, Z., Liao, J., Zhang, T., He, Y., Wang, W., Chen, P. and Song, Y. (2025) 'Acute kidney injury: pathogenesis and therapeutic interventions', Molecular Biomedicine, 6, article 28. DOI: 10.1186/s43556-025-00293-4. Available at: https://link.springer.com/article/10.1186/s43556-025-00293-4 (Accessed: 20 July 2026).