What causes high BUN and low Calcium?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your Calcium is in between 8.5 mg/dL and 10.1 mg/dL then you need not worry as these are the normal ranges for BUN and Calcium 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	6.062
5-10 years	6.125
10-15 years	6.188
15-20 years	6.252
20-25 years	6.317
25-30 years	6.382
30-35 years	6.448
35-40 years	6.515
40-45 years	6.582
45-50 years	6.65
50-55 years	6.719
55-60 years	6.788
60-70 years	6.858
70-80 years	6.929
80-90 years	7.001
90-100 years	7.073
>100 years	7.146

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

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Normal range of Calcium : 8.5 - 10.1 mg/dL

Ideal values of Calcium depending on age :

Age	Ideal Calcium value
<5 years	8.588
5-10 years	8.677
10-15 years	8.767
15-20 years	8.857
20-25 years	8.948
25-30 years	9.04
30-35 years	9.133
35-40 years	9.227
40-45 years	9.322
45-50 years	9.418
50-55 years	9.515
55-60 years	9.613
60-70 years	9.712
70-80 years	9.812
80-90 years	9.913
90-100 years	10.015
>100 years	10.014

High BUN and low Calcium can be caused by a lot of reasons. If you take BUN and Calcium blood tests and the results are higher than 20 mg/dL for BUN and lower than 8.5 mg/dL for Calcium, 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 Calcium Tests Are Done :

If your doctor wants BUN and Calcium tests on you, you may need to go through these tests. During the BUN and Calcium 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 Calcium Test reports by your pathologist.