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Urea Testing (BUN)

The Urea test is also known as a Blood Urea Nitrogen test.

All you need to know about testing Urea levels with a laboratory test

  • What is the Urea test for?
  • How to test Urea?
  • What if Urea results are high?
  • What if Urea results are low?
  • Who should take the Kidney Function Venous Blood test?

Urea Testing UK Statistics 2026

Icon For Urea
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7.2% of people tested have Urea levels which are too high.

And 1.1% have levels that are too low.

5.4

Low
< 2.5

Normal
2.5 - 7.8

High
7.8 +

The average Urea result is 5.4 mmol/L
Note what is normal for you may differ for your age and sex.

Are you in the 91.7% with normal results?
Get Tested ›

What Is The Urea Test For?

Blood Urea Nitrogen (BUN) is a waste product naturally produced in your body.

Proteins eaten in your diet are processed by the liver and during this process blood urea nitrogen is released into the blood.

The BUN is passed to your kidneys and then healthy kidneys flush it from the body in urine.

As such, abnormal levels may indicate an issue with your kidney function.

How To Test Urea

By buying a laboratory test kit with professional nurse or clinic collection, you can accurately measure Urea for total reassurance.

Professional analysis in an accredited laboratory ensures rapid result delivery.

The Vitall Kidney Function nurse or clinic test kit includes a Urea test and is available for just £199.00.

Tests which include a Urea test:

Health is in your hands
Health is in your hands
Take Control Of Your Health | Home Blood Testing Services

Kidney Function Test Kit

Kidney Function test kit
Kidney Function Home Test Kit UK

Kidney Function Test Kit

Assess normal kidney function and your electolytes

£199.00

View Full Details ›
Health is in your hands
Health is in your hands
Take Control Of Your Health | Home Blood Testing Services

Kidney Function Essentials Test Kit

Kidney Function Essentials test kit
Kidney Function Essentials Home Test Kit UK

Kidney Function Essentials Test Kit

Assess normal kidney function and indicate kidney damage

£79.00

View Full Details ›

What if Urea Results Are High?

High urea levels can indicate reduced kidney function, and are often associated with acute or chronic kidney disease.

Urea levels can also be affected by other factors, including dehydration, obstruction to urine flow, or conditions that reduce blood flow to the kidneys.

This level is generally treated as clinically significant and may be reviewed further. Additional blood tests are sometimes used to help clarify the cause.

Because there are several possible causes of a high urea level, the result is usually interpreted in the context of other clinical information and related results.

What if Urea Results Are Low?

Low urea levels are uncommon and often reflect a low-protein diet or low muscle mass. This is not usually a cause for concern.

Low urea can be seen in severe liver disease or malnutrition, but urea is not used to diagnose or monitor these conditions. Low urea levels are also seen in normal pregnancy.

A low urea result is often not treated as clinically significant.

Who Should Take This Test?

Measure your Urea levels and assess normal kidney function and your electolytes with a Kidney Function nurse or clinic centrifuged venous bloodtest kit

You get the convenient testing with the reassurance of professional clinical analysis. Your results are delivered quickly & securely online.

This Kidney Function Test is advised if you:

  • want the convenience of home testing without waiting for a GP appointment;
  • need a high quality, clinically accredited test done in a professional clinical laboratory.

Other Biomarkers Often Tested With Urea

Urine, swab or bood test. This test is available to buy online Chloride
Urine, swab or bood test. This test is available to buy online Creatinine
Urine, swab or bood test. This test is available to buy online Estimated Glomerular Filtration Rate
Urine, swab or bood test. This test is available to buy online Potassium
Urine, swab or bood test. This test is available to buy online Sodium
Urine, swab or bood test. This test is available to buy online Urea

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