Creatinine Blood Test – Assess Your Kidney Function
Creatinine is produced during normal muscle activity and is filtered out of the blood by the kidneys. Because healthy kidneys maintain a stable creatinine level, measuring it provides a reliable snapshot of renal performance. The test is commonly ordered alongside sodium and potassium to give a broader view of kidney and electrolyte health.
Why Test Creatinine?
A creatinine test helps identify early signs of kidney dysfunction before symptoms appear. It is particularly relevant if you consume significant amounts of alcohol, follow a nutrient-poor diet, or have risk factors such as diabetes, hypertension, or a family history of kidney disease. Tracking creatinine over time also helps you evaluate the effect of lifestyle changes and treatments.
What Do High Creatinine Levels Mean?
Elevated creatinine typically indicates that the kidneys are not filtering blood as efficiently as they should. Common causes include chronic kidney disease, acute kidney injury, severe dehydration, diabetes, thyroid disorders, and high blood pressure. Medications and urinary tract obstructions can also raise levels.
What Do Low Creatinine Levels Mean?
Low creatinine is less common and usually less clinically significant. It can result from reduced muscle mass, severe weight loss, malnutrition (especially protein deficiency), liver disease, or pregnancy. Persistent low values warrant investigation of the underlying cause.
Symptoms to Watch For
- Decreased urine output
- Swelling in the legs, ankles, or around the eyes
- Fatigue and confusion
- Shortness of breath
- Nausea
- Dark-coloured urine
- Back or flank pain
Who Should Get Tested?
- Anyone with diabetes or high blood pressure
- People with a family history of kidney disease
- Those taking medications that may affect kidney function
- Individuals experiencing unexplained fatigue or swelling
- People who consume alcohol regularly
How to Prepare for Your Test
No special preparation is needed. Bring a valid ID to the sampling centre.
Order Your Blood Test
Test your Creatinine levels with an accredited Swedish laboratory. Results within days, reviewed by Wellth.
Frequently Asked Questions
Can exercise affect my creatinine result?
Is creatinine the same as creatine?
How often should I test creatinine?
Reviewed by
Wellth Team
Wellth
Our content is written and reviewed by Wellth, and fact-checked against peer-reviewed research and current Swedish clinical guidelines.
Learn more about our team →Medical Disclaimer
The information on this page is provided for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Wellth provides health information and testing services but is not a substitute for clinical care. Always consult a qualified healthcare provider if you have questions about a medical condition. If you are experiencing severe or urgent symptoms, contact your doctor or call 1177 Vårdguiden. Blood test results should be interpreted by a qualified healthcare professional in the context of your complete medical history.