Is BUN 43 high, normal or dangerous? What does Blood urea nitrogen level 43 mean?

📅 Medical Review Date: December 22, 2025

Your BUN level of 43 is a High BUN level.

High 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.

Important - Scroll to the end of this article to see how our patients managed their high BUN levels

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	6.258
5-10 years	6.527
10-15 years	6.808
15-20 years	7.101
20-25 years	7.406
25-30 years	7.724
30-35 years	8.056
35-40 years	8.402
40-45 years	8.763
45-50 years	9.14
50-55 years	9.533
55-60 years	9.943
60-70 years	10.371
70-80 years	10.817
80-90 years	11.282
90-100 years	11.767
>100 years	12.273

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

Misdiagnosis is more common than people think—and the consequences can be serious. Delayed treatment, unnecessary medication, or worse. If you want a second opinion on your blood work, one option is to upload it to a site like wholebodyprotocol.com, where world-class doctors review your results. They charge a small fee—around $90 (though you'll want to check the latest price as it fluctuates)—and email you a detailed report. With over 12 million people affected by misdiagnosis every year, that little bit of extra peace of mind can go a long way.

Important - Read more questions about high BUN levels after this video message

Important - At the end of this article read how our patients treated their high BUN levels

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

Important - At the end of this article read how our patients treated their high BUN levels

Also Read :How our patients treated their high bun?

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	6.266
5-10 years	6.544
10-15 years	6.834
15-20 years	7.137
20-25 years	7.453
25-30 years	7.783
30-35 years	8.128
35-40 years	8.488
40-45 years	8.864
45-50 years	9.257
50-55 years	9.667
55-60 years	10.095
60-70 years	10.542
70-80 years	11.009
80-90 years	11.497
90-100 years	12.006
>100 years	12.538

Also Read :Symptoms of High BUN

Can Low or High BUN cause Heart Problems?

Read on to know how abnormal BUN affects heart

Know more

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.

Important :How our patients treated their high bun?

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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.