Creatinine, Serum
- Category
- Kidney
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 2 days
- Fasting
- No Fasting
- Age
- 5+ Years
What Is This Test?
Measures creatinine, a waste product from normal muscle activity that is removed from the blood by the kidneys.
Why this test is performed?
The main test for kidney function. A rising creatinine suggests the kidneys are not filtering well. It is also used to calculate eGFR and to dose certain medicines safely.
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.
- Report time: In 2 days
- No fasting
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Frequently asked questions
Yes. Large meat meals, creatine supplements and heavy exercise can raise creatinine slightly. Avoid them for 24 hours before the test.
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 11–35 hours after the sample reaches the lab. You will receive the report online.
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