What causes high BUN and low Phosphate?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your Phosphate is in between 2.4 mg/dL and 4.5 mg/dL then you need not worry as these are the normal ranges for BUN and Phosphate 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	6.064
5-10 years	6.129
10-15 years	6.194
15-20 years	6.26
20-25 years	6.327
25-30 years	6.394
30-35 years	6.462
35-40 years	6.531
40-45 years	6.6
45-50 years	6.67
50-55 years	6.741
55-60 years	6.813
60-70 years	6.885
70-80 years	6.958
80-90 years	7.032
90-100 years	7.107
>100 years	7.183

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

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Normal range of Phosphate : 2.4 - 4.5 mg/dL

Ideal values of Phosphate depending on age :

Age	Ideal Phosphate value
<5 years	2.426
5-10 years	2.452
10-15 years	2.478
15-20 years	2.504
20-25 years	2.531
25-30 years	2.558
30-35 years	2.585
35-40 years	2.613
40-45 years	2.641
45-50 years	2.669
50-55 years	2.697
55-60 years	2.726
60-70 years	2.755
70-80 years	2.784
80-90 years	2.814
90-100 years	2.844
>100 years	2.874

High BUN and low Phosphate can be caused by a lot of reasons. If you take BUN and Phosphate blood tests and the results are higher than 20 mg/dL for BUN and lower than 2.4 mg/dL for Phosphate, 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 Phosphate Tests Are Done :

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