Blood Urea 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 urea, a waste product formed in the liver when protein is broken down and removed by the kidneys.
Why this test is performed?
Helps assess kidney function and hydration. High urea is seen in kidney disease, dehydration, high-protein diets or bleeding in the gut; low urea may occur in liver disease or malnutrition.
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
They measure the same thing expressed differently — BUN is the nitrogen part of urea (BUN ≈ urea ÷ 2.14).
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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