What causes high Bilirubin direct and low BUN?

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

If your Bilirubin direct is in between 0.1 mg/dL and 0.2 mg/dL and your BUN is in between 6 mg/dL and 20 mg/dL then you need not worry as these are the normal ranges for Bilirubin direct and BUN respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Some examples of conditions that can increase or decrease Bilirubin levels include:

• Gallstones present in the bile ducts
• Hepatitis A, hepatitis B, hepatitis C
• Scarring of the bile ducts
• Lack of oxygen (hypoxia)
• Liver disease

Bilirubin direct treatment - Click to read 10 GOLDEN ARTICLES on Liver health

Normal range of Bilirubin direct : 0.1 - 0.2 mg/dL

Ideal values of Bilirubin direct depending on age :

Age	Ideal Bilirubin direct value
<5 years	0.11111
5-10 years	0.11223
10-15 years	0.11336
15-20 years	0.1145
20-25 years	0.11566
25-30 years	0.11683
30-35 years	0.11801
35-40 years	0.1192
40-45 years	0.1204
45-50 years	0.12162
50-55 years	0.12285
55-60 years	0.12409
60-70 years	0.12534
70-80 years	0.12661
80-90 years	0.12789
90-100 years	0.12918
>100 years	0.13048

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

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	6.122
10-15 years	6.184
15-20 years	6.246
20-25 years	6.309
25-30 years	6.373
30-35 years	6.437
35-40 years	6.502
40-45 years	6.568
45-50 years	6.634
50-55 years	6.701
55-60 years	6.769
60-70 years	6.837
70-80 years	6.906
80-90 years	6.976
90-100 years	7.046
>100 years	7.117

High Bilirubin direct and low BUN can be caused by a lot of reasons. If you take Bilirubin direct and BUN blood tests and the results are higher than 0.2 mg/dL for Bilirubin direct and lower than 6 mg/dL for BUN, 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 Bilirubin direct and BUN Tests Are Done :

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

Medical References

• Cleveland Clinic – Bilirubin Test: Understanding High vs. Low Levels & Causes
• Mayo Clinic – Bilirubin test
• MedlinePlus – Bilirubin Blood Test
• Medscape – Bilirubin: Reference Range, Interpretation, Collection and Panels
• NCBI – Evaluating Elevated Bilirubin Levels in Asymptomatic Adults