Check kidney function with Cystatin C
Cystatin C is a blood test that helps provide a clearer picture of how well your kidneys are functioning. The kidneys play a vital role in clearing waste products from the blood and regulating the body's fluid balance. Since impaired kidney function often develops without clear symptoms, a blood test can provide valuable information about your kidney health.
Why test for Cystatin C?
A Cystatin C test can be particularly valuable if you want to check your kidney function or obtain a supplementary assessment of your kidney markers.
The test may be relevant for you if you:
- Want better insight into your kidney health and how effectively your kidneys filter the blood.
- Have high blood pressure or diabetes, two conditions that can increase the risk of impaired kidney function.
- Exercise heavily or have high muscle mass, factors that can affect creatinine levels and make it more difficult to assess kidney function.
- Have previously had abnormal kidney test results and want to follow up on them.
- Want to supplement a creatinine test to get a more reliable estimate of the kidneys' filtration capacity.
What can the results show?
The blood test measures the level of Cystatin C in the blood. An elevated level may indicate impaired kidney filtration capacity. Cystatin C can also be used to calculate eGFR, a measure that estimates how effectively the kidneys filter the blood.
The result can help you understand your kidney markers and whether there is a reason to investigate kidney function further. However, an abnormal value does not necessarily indicate kidney disease and should be assessed in conjunction with other relevant information.Reference values for Cystatin C
Reference values for Cystatin C vary depending on age and the testing laboratory. According to Karolinska University Hospital, the following reference ranges apply to adults:
A value above the reference range may indicate impaired kidney function. However, an abnormal result does not automatically imply kidney disease, as other factors can also affect Cystatin C levels. The result should be evaluated alongside other test results and individual circumstances.
The kidneys are vital organs that filter the blood, regulate fluid balance, and remove waste products through urine. They play a central role in blood pressure regulation, electrolyte balance, and the production of hormones that affect blood formation and calcium metabolism. Renal markers are analyzed to assess kidney function and detect early signs of kidney disease. They can provide important information about filtration capacity, fluid balance, and any effects on the kidneys.
Cystatin C
Before visiting a reception for sampling, you need to do the following:
Activate referral and select reception
To activate your referral, simply follow the instructions that you will receive via email after completing the purchase. The email contains an activation code, by clicking on the link in the email you enter the flow to fill in any information, activate the referral and select reception in the sample answer service zample.
Before the sampling
- Rest for 15 minutes in place on the sampling device.
- Bring identification.
The referral is available digitally at the sampling unit after you activate it, follow the instructions you receive via email.Here you can read our guidelines before taking samples.
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In our test-taking service Zample, your result is displayed as a line on top of bars representing average values for others in different age groups. This way, you can instantly see how your values compare to others your age, giving you a clearer and more intuitive picture of your health.
How does it work?
Get control of your health - four simple steps
1. Order a health check
Choose a health check or create your own by adding optional health tests to your cart.
2. Activate the referral
After payment, you will receive an activation code via email. Log in via "My test results" or click on the link in the email, and use the code to activate the referral and choose reception.
3. Leave the blood sample
You visit the chosen reception to do your test. Your referral is valid for 5 months after activation.
4. Test answers and statement
You will receive your test answers within 1-5 working days, the test answers are received continuously. Once all test results are received, they are reviewed and issued by a doctor.
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Simon Mäntylä
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Sampling fee?
The sample collection fee is a fixed cost that refers to the visit to the clinic where you submit your sample. The fee is not affected by how many tests you have ordered, but varies depending on the order value:
- For order values under SEK 350, the sampling fee is SEK 119.
- For order values between SEK 350 and SEK 1 000, the fee is SEK 49.
For purchases over 1 000 SEK, the sampling fee is included.