What causes high BUN and low MCV?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your MCV is in between 83 fL and 101 fL then you need not worry as these are the normal ranges for BUN and MCV 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	6.183
15-20 years	6.245
20-25 years	6.308
25-30 years	6.371
30-35 years	6.435
35-40 years	6.5
40-45 years	6.565
45-50 years	6.631
50-55 years	6.698
55-60 years	6.765
60-70 years	6.833
70-80 years	6.902
80-90 years	6.971
90-100 years	7.041
>100 years	7.112

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

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Normal range of MCV : 83 - 101 fL

Ideal values of MCV depending on age :

Age	Ideal MCV value
<5 years	83.834
5-10 years	84.677
10-15 years	85.528
15-20 years	86.388
20-25 years	87.256
25-30 years	88.133
30-35 years	89.019
35-40 years	89.914
40-45 years	90.818
45-50 years	91.731
50-55 years	92.653
55-60 years	93.584
60-70 years	94.525
70-80 years	95.475
80-90 years	96.435
90-100 years	97.404
>100 years	98.383

High BUN and low MCV can be caused by a lot of reasons. If you take BUN and MCV blood tests and the results are higher than 20 mg/dL for BUN and lower than 83 fL for MCV, 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 MCV Tests Are Done :

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