What causes high BUN and low Bilirubin indirect?

High BUN and low Bilirubin indirect can be caused by many reasons.

If your BUN is in between 6 mg/dL and 20 mg/dL and your Bilirubin indirect is in between 0.1 mg/dL and 1 mg/dL then you need not worry as these are the normal ranges for BUN and Bilirubin indirect 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	6.061
5-10 years	6.123
10-15 years	6.186
15-20 years	6.249
20-25 years	6.313
25-30 years	6.377
30-35 years	6.442
35-40 years	6.508
40-45 years	6.574
45-50 years	6.641
50-55 years	6.709
55-60 years	6.777
60-70 years	6.846
70-80 years	6.916
80-90 years	6.987
90-100 years	7.058
>100 years	7.13

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

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Normal range of Bilirubin indirect : 0.1 - 1 mg/dL

Ideal values of Bilirubin indirect depending on age :

Age	Ideal Bilirubin indirect value
<5 years	0.10102
5-10 years	0.10205
10-15 years	0.10309
15-20 years	0.10414
20-25 years	0.1052
25-30 years	0.10627
30-35 years	0.10736
35-40 years	0.10846
40-45 years	0.10957
45-50 years	0.11069
50-55 years	0.11182
55-60 years	0.11296
60-70 years	0.11411
70-80 years	0.11528
80-90 years	0.11646
90-100 years	0.11765
>100 years	0.11885

High BUN and low Bilirubin indirect can be caused by a lot of reasons. If you take BUN and Bilirubin indirect blood tests and the results are higher than 20 mg/dL for BUN and lower than 0.1 mg/dL for Bilirubin indirect, 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 Bilirubin indirect Tests Are Done :

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