Kidney & Electrolytes
Serum Creatinine
Kidney & Electrolytes
Kidney filtration marker. Used to calculate glomerular filtration rate (eGFR).
VAT-exempt medical service
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.
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 a high value can 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 a low value can 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.
No special preparation is needed. Bring a valid ID to the sampling centre.
Order your test
Choose your test and pay online. Your lab referral is created straight away.
Give your sample
Visit any of our partner sampling locations. No appointment needed at most of them.
The lab analyses it
Your sample is analysed at an accredited Swedish laboratory.
Get your results
Your values appear in your account with reference ranges and an explanation of each marker.
Intense exercise can temporarily raise creatinine because it increases muscle breakdown. Avoid heavy training on the day of the test for the most accurate result.
No. Creatine is a compound muscles use for energy, while creatinine is the waste product created when creatine is broken down. Creatine supplements may raise creatinine levels without indicating kidney problems.
For general health screening, once a year is sufficient. If you have known kidney disease or risk factors, your doctor may recommend more frequent monitoring.