Blood Urea Nitrogen (BUN) 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 2 days
- Fasting
- No Fasting
- Age
- 5+ Years
What Is This Test?
Measures blood urea nitrogen (BUN), the nitrogen portion of urea, a waste product removed by the kidneys.
Why this test is performed?
Used with creatinine to assess kidney function and hydration. The BUN/creatinine ratio can help distinguish dehydration from 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.
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- Report time: In 2 days
- No fasting
Creatinine Spot Urine Test
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Urine sample — preferably first-morning, mid-stream, in a sterile container
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- Report time: In 2 days
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Urine sample — preferably first-morning, mid-stream, in a sterile container
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- Report time: In 2 days
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Estimated Glomerular Filtration Rate (eGFR) Test
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Blood sample taken from a vein in your arm
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- Report time: In 2 days
- No fasting
Urea, Spot Urine
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Urine sample — preferably first-morning, mid-stream, in a sterile container
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Frequently asked questions
Dehydration, high-protein diets, gut bleeding, steroids and heart failure.
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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