Blood Urea Nitrogen (BUN) Blood Test
£58 ✓ In Stock
Your sample goes to a UKAS accredited laboratory meeting ISO 15189 standards.
After you receive your order confirmation email, please reply with your date of birth.
How it works
Your testing journey
From order to results in four simple steps. Full transparency on where each step happens and what it costs.
Receive your kit by post
Dispatched same working day if ordered before 3pm. Royal Mail Tracked delivery, typically 1–3 working days. 90% of kits arrive within 24 hours.
Visit a partner clinic
Book a phlebotomy appointment at one of our 365+ UK partner clinics. Take your kit with you — the phlebotomist will collect your sample using the materials provided.
Phlebotomy fee applies (paid at clinic)
Venous blood draw at a clinic
A trained phlebotomist takes a small blood sample from a vein in your arm using the vacutainers provided in your kit. The appointment takes around 10 minutes.
Return by prepaid envelope
Seal your sample in the biohazard bag provided and drop it in any Royal Mail postbox using the prepaid Tracked 24 envelope. Post Monday–Thursday for best results.
Venous Blood Collection Kit
This kit is sent to you and taken to your chosen clinic. The phlebotomist will collect your sample using the materials provided.
- 1Vacutainer blood collection tubes
- 2Needle and butterfly needle
- 3Tourniquet
- 4Alcohol swab
- 5Cotton wool and gauze
- 6Adhesive plaster
- 7Biohazard specimen bag
- 8Prepaid return envelope (Royal Mail Tracked 24)
- 9Laboratory request form
- 10Instructions for the phlebotomist
Urea is a waste product produced by the body when it breaks down proteins in the liver. Once urea is made, it is transported to the kidneys, which filter it out of the blood and remove it from the body in urine. Measuring urea levels in the blood can therefore reflect how well both the liver and the kidneys are functioning. Elevated urea may indicate kidney impairment, dehydration, high protein intake, gastrointestinal bleeding, or heart failure. Low urea levels are less common but can occur with severe liver disease, malnutrition, or overhydration. It's important to note that even if one kidney is severely damaged but the other is functioning well, results may still appear normal. Results outside the normal range should be discussed with your GP.
Blood urea nitrogen (BUN) measures the amount of nitrogen in your blood that comes from urea, a waste product created when your liver breaks down proteins. Your kidneys filter urea from your blood and remove it in urine, so BUN levels provide important information about both kidney function and protein metabolism. Elevated BUN levels may indicate that your kidneys aren't filtering waste effectively, or could reflect dehydration, high protein intake, increased protein breakdown in the body, gastrointestinal bleeding, or certain medications. Low BUN levels are less common but can occur with severe liver disease, malnutrition, or overhydration. The BUN:creatinine ratio (if creatinine is also measured) can help distinguish between different causes of elevated levels. Results outside the normal range should be discussed with your GP.
This test is for screening and information only — it is not a medical diagnosis or professional advice. Please have your results reviewed by a qualified doctor or healthcare provider who can explain what they mean for your personal health situation. If your results show anything outside the normal range, or if you're worried about your health, see your doctor as soon as you can. Don't change any medications or treatments based on these results alone — always talk to your healthcare provider first.
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Four steps to clarity
01
Pick your panel
Browse over 200 clinically designed test kits and choose the one that fits your goals.
02
Kit to your door
Everything you need arrives in discreet packaging with step-by-step instructions inside.
03
Collect your sample
Follow the simple instructions in your kit — whether it's a finger-prick at home or a venous draw at a partner clinic.
04
Insights delivered
Clear, easy-to-understand results sent to you online with actionable health guidance.
Frequently asked questions
Blood Urea Nitrogen measures nitrogen from urea, a waste product of protein metabolism processed by the kidneys. Elevated BUN can indicate kidney dysfunction, dehydration, high-protein diet, or GI bleeding.
Not required, but avoid unusually high protein intake in the 24 hours before testing for the most representative result.
BUN is one component of kidney assessment. It is often tested alongside creatinine and eGFR for a more complete picture. BUN alone is less specific than creatinine for kidney disease.
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