Is BUN 5 low, normal or dangerous? What does Blood urea nitrogen level 5 mean?

📅 Medical Review Date: December 22, 2025

Your BUN level of 5 is a Low BUN level.

A BUN level of 5 mg/dL usually means the liver is not producing enough urea or the kidneys are filtering too efficiently. It suggests low protein intake or liver disease. Low levels of BUN can cause fatigue, weakness, malnutrition symptoms, and poor healing. This can be caused by low protein diet, liver failure, pregnancy, or overhydration. Further tests are often needed to identify the cause and guide appropriate treatment.

Low BUN levels may indicate underlying health problems. The normal range is typically between 6 mg/dL and 20 mg/dL. If your levels are outside this range, it's important to speak with a healthcare provider. Consulting a doctor is recommended to determine the cause and appropriate next steps.

The normal BUN range for men is :6 - 20 mg/dL

Ideal values of BUN depending on age (male) :

Age	Ideal BUN value
<5 years	6.3
5-10 years	6.615
10-15 years	6.946
15-20 years	7.293
20-25 years	7.658
25-30 years	8.041
30-35 years	8.443
35-40 years	8.865
40-45 years	9.308
45-50 years	9.773
50-55 years	10.262
55-60 years	10.775
60-70 years	11.314
70-80 years	11.88
80-90 years	12.474
90-100 years	13.098
>100 years	13.753

*Ideal values are calculated based on our database of patient records

Get Advice via Email : Send us your blood test report, and our BUN experts will review it. You'll receive a detailed analysis and personalized treatment guidance via email within 12 hours. If you have additional blood test results besides BUN, please include those too—an accurate diagnosis often requires a full view of all abnormalities. Upload blood test report now

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Some examples of conditions that increase or decrease BUN levels include:

• Kidney failure
• Decreased blood flow to the kidneys
• Congestive heart failure
• Dehydration
• Conditions that can block the flow of urine

Receive world-class medical opinion about your low BUN levels over email.Upload blood test report now

You can learn techniques to reduce high BUN levels by reading this 100 page eBook. This book is written by a patient himself and reviewed by the doctors of Medchunk. Read eBook here.

Normal range of BUN found among women :6-20 mg/dL

Ideal values of BUN depending on age (female) :

Age	Ideal BUN value
<5 years	6.309
5-10 years	6.634
10-15 years	6.976
15-20 years	7.335
20-25 years	7.713
25-30 years	8.11
30-35 years	8.528
35-40 years	8.967
40-45 years	9.429
45-50 years	9.915
50-55 years	10.426
55-60 years	10.963
60-70 years	11.528
70-80 years	12.122
80-90 years	12.746
90-100 years	13.402
>100 years	14.092

If you take a BUN blood test and the results are not in the normal range (6-20 mg/dL), your physician may recommend more tests to figure out the problem. You might also get this test if your physician thinks you have some other disease.

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How the BUN Test Is Done :

When your doctor orders a BUN test, it involves a straightforward blood draw to measure your BUN levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your BUN test results are usually available within a few hours.

Medical References

• Mayo Clinic – Blood urea nitrogen (BUN) test
• MedlinePlus – BUN (Blood Urea Nitrogen)
• Cleveland Clinic – Blood Urea Nitrogen (BUN): Testing, Levels & Indication

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