What causes high BUN and low Sodium?

High BUN and low Sodium can be caused by many reasons.

If your BUN is in between 6 mg/dL and 20 mg/dL and your Sodium is in between 136 mmol/L and 145 mmol/L then you need not worry as these are the normal ranges for BUN and Sodium respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Normal range of BUN : 6 - 20 mg/dL

Ideal values of BUN depending on age :

Age	Ideal BUN value
<5 years	6.063
5-10 years	6.126
10-15 years	6.19
15-20 years	6.255
20-25 years	6.32
25-30 years	6.386
30-35 years	6.453
35-40 years	6.52
40-45 years	6.588
45-50 years	6.657
50-55 years	6.727
55-60 years	6.797
60-70 years	6.868
70-80 years	6.94
80-90 years	7.013
90-100 years	7.086
>100 years	7.16

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

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Normal range of Sodium : 136 - 145 mmol/L

Ideal values of Sodium depending on age :

Age	Ideal Sodium value
<5 years	137.421
5-10 years	138.857
10-15 years	140.308
15-20 years	141.774
20-25 years	143.256
25-30 years	144.753
30-35 years	144.738
35-40 years	144.723
40-45 years	144.707
45-50 years	144.691
50-55 years	144.675
55-60 years	144.659
60-70 years	144.644
70-80 years	144.629
80-90 years	144.613
90-100 years	144.597
>100 years	144.581

High BUN and low Sodium can be caused by a lot of reasons. If you take BUN and Sodium blood tests and the results are higher than 20 mg/dL for BUN and lower than 136 mmol/L for Sodium, your physician may recommend more tests to figure out the problem. You might also get these tests if your physician thinks you have some other disease.

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How the BUN and Sodium Tests Are Done :

If your doctor wants BUN and Sodium tests on you, you may need to go through these tests. During the BUN and Sodium blood tests, a pathologist will put a needle into your veins and take out a small quantity of blood. A pathologist is a physician in the medical field who thoroughly studies the causes and effects of disease. Within a few hours you will get your BUN and Sodium Test reports by your pathologist.

Medical References

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