What causes high BUN and low Phosphorus?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your Phosphorus is in between 2.5 mg/dL and 4.5 mg/dL then you need not worry as these are the normal ranges for BUN and Phosphorus 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	6.127
10-15 years	6.191
15-20 years	6.256
20-25 years	6.322
25-30 years	6.388
30-35 years	6.455
35-40 years	6.523
40-45 years	6.591
45-50 years	6.66
50-55 years	6.73
55-60 years	6.801
60-70 years	6.872
70-80 years	6.944
80-90 years	7.017
90-100 years	7.091
>100 years	7.165

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

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Normal range of Phosphorus : 2.5 - 4.5 mg/dL

Ideal values of Phosphorus depending on age :

Age	Ideal Phosphorus value
<5 years	2.526
5-10 years	2.552
10-15 years	2.579
15-20 years	2.606
20-25 years	2.633
25-30 years	2.661
30-35 years	2.689
35-40 years	2.717
40-45 years	2.745
45-50 years	2.774
50-55 years	2.803
55-60 years	2.832
60-70 years	2.862
70-80 years	2.892
80-90 years	2.922
90-100 years	2.953
>100 years	2.984

High BUN and low Phosphorus can be caused by a lot of reasons. If you take BUN and Phosphorus blood tests and the results are higher than 20 mg/dL for BUN and lower than 2.5 mg/dL for Phosphorus, 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 Phosphorus Tests Are Done :

If your doctor wants BUN and Phosphorus tests on you, you may need to go through these tests. During the BUN and Phosphorus 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 Phosphorus 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