What causes high BUN and low MCHC?

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

If your BUN is in between 6 mg/dL and 20 mg/dL and your MCHC is in between 31.5 g/dL and 34.5 g/dL then you need not worry as these are the normal ranges for BUN and MCHC 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	6.372
30-35 years	6.436
35-40 years	6.501
40-45 years	6.566
45-50 years	6.632
50-55 years	6.699
55-60 years	6.766
60-70 years	6.834
70-80 years	6.903
80-90 years	6.973
90-100 years	7.043
>100 years	7.114

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

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Normal range of MCHC : 31.5 - 34.5 g/dL

Ideal values of MCHC depending on age :

Age	Ideal MCHC value
<5 years	31.817
5-10 years	32.137
10-15 years	32.461
15-20 years	32.788
20-25 years	33.118
25-30 years	33.451
30-35 years	33.788
35-40 years	34.128
40-45 years	34.472
45-50 years	34.468
50-55 years	34.464
55-60 years	34.46
60-70 years	34.456
70-80 years	34.453
80-90 years	34.45
90-100 years	34.447
>100 years	34.444

High BUN and low MCHC can be caused by a lot of reasons. If you take BUN and MCHC blood tests and the results are higher than 20 mg/dL for BUN and lower than 31.5 g/dL for MCHC, 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 MCHC Tests Are Done :

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