Cystatin C Test
- Category
- Kidney
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 5 days
- Fasting
- No Fasting
- Age
- 5+ Years
What Is This Test?
Measures cystatin C, a small protein filtered by the kidneys that is less affected by muscle mass than creatinine.
Why this test is performed?
Gives a more accurate estimate of kidney function in people with very high or low muscle mass, the elderly and children, and helps confirm early chronic kidney disease.
Who should take this test?
Swelling of feet or face, change in urine, high BP, diabetes, kidney stones, or people on long-term painkillers.
Test Preparation
No fasting needed.
Medical disclaimer · for information only, not medical advice
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.
Read our Editorial Policy and Medical Review Process.
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- No fasting
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Frequently asked questions
Creatinine can stay normal in early kidney disease or in people with low muscle mass; cystatin C can pick up changes earlier.
No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.
Blood sample taken from a vein in your arm.
Usually within 3–4 days after the sample reaches the lab. You will receive the report online.
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