What causes high BUN and low Hematocrit?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your Hematocrit is in between 40 % and 50 % then you need not worry as these are the normal ranges for BUN and Hematocrit 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	6.06
5-10 years	6.121
10-15 years	6.182
15-20 years	6.244
20-25 years	6.307
25-30 years	6.37
30-35 years	6.434
35-40 years	6.499
40-45 years	6.564
45-50 years	6.63
50-55 years	6.697
55-60 years	6.764
60-70 years	6.832
70-80 years	6.901
80-90 years	6.97
90-100 years	7.04
>100 years	7.111

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

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Normal range of Hematocrit : 40 - 50 %

Ideal values of Hematocrit depending on age :

Age	Ideal Hematocrit value
<5 years	40.402
5-10 years	40.808
10-15 years	41.218
15-20 years	41.632
20-25 years	42.05
25-30 years	42.472
30-35 years	42.898
35-40 years	43.329
40-45 years	43.764
45-50 years	44.203
50-55 years	44.647
55-60 years	45.095
60-70 years	45.548
70-80 years	46.005
80-90 years	46.467
90-100 years	46.934
>100 years	47.405

High BUN and low Hematocrit can be caused by a lot of reasons. If you take BUN and Hematocrit blood tests and the results are higher than 20 mg/dL for BUN and lower than 40 % for Hematocrit, 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 Hematocrit Tests Are Done :

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