What causes high BUN and low TIBC?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your TIBC is in between 250 mcg/dL and 450 mcg/dL then you need not worry as these are the normal ranges for BUN and TIBC 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	6.195
15-20 years	6.261
20-25 years	6.328
25-30 years	6.396
30-35 years	6.465
35-40 years	6.534
40-45 years	6.604
45-50 years	6.675
50-55 years	6.746
55-60 years	6.818
60-70 years	6.891
70-80 years	6.965
80-90 years	7.04
90-100 years	7.115
>100 years	7.191

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

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Normal range of TIBC : 250 - 450 mcg/dL

Ideal values of TIBC depending on age :

Age	Ideal TIBC value
<5 years	252.678
5-10 years	255.384
10-15 years	258.119
15-20 years	260.883
20-25 years	263.677
25-30 years	266.501
30-35 years	269.355
35-40 years	272.24
40-45 years	275.156
45-50 years	278.103
50-55 years	281.081
55-60 years	284.091
60-70 years	287.134
70-80 years	290.209
80-90 years	293.317
90-100 years	296.458
>100 years	299.633

High BUN and low TIBC can be caused by a lot of reasons. If you take BUN and TIBC blood tests and the results are higher than 20 mg/dL for BUN and lower than 250 mcg/dL for TIBC, 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 TIBC Tests Are Done :

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