What causes high BUN and low Cystatin c?

High BUN and low Cystatin c can be caused by many reasons.

If your BUN is in between 6 mg/dL and 20 mg/dL and your Cystatin c is in between 0.62 mg/L and 1.03 mg/L then you need not worry as these are the normal ranges for BUN and Cystatin c 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	6.128
10-15 years	6.193
15-20 years	6.259
20-25 years	6.325
25-30 years	6.392
30-35 years	6.46
35-40 years	6.528
40-45 years	6.597
45-50 years	6.667
50-55 years	6.738
55-60 years	6.809
60-70 years	6.881
70-80 years	6.954
80-90 years	7.028
90-100 years	7.102
>100 years	7.177

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

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Normal range of Cystatin c : 0.62 - 1.03 mg/L

Ideal values of Cystatin c depending on age :

Age	Ideal Cystatin c value
<5 years	0.627
5-10 years	0.634
10-15 years	0.641
15-20 years	0.648
20-25 years	0.655
25-30 years	0.662
30-35 years	0.669
35-40 years	0.676
40-45 years	0.683
45-50 years	0.69
50-55 years	0.697
55-60 years	0.704
60-70 years	0.711
70-80 years	0.719
80-90 years	0.727
90-100 years	0.735
>100 years	0.743

High BUN and low Cystatin c can be caused by a lot of reasons. If you take BUN and Cystatin c blood tests and the results are higher than 20 mg/dL for BUN and lower than 0.62 mg/L for Cystatin c, 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 Cystatin c Tests Are Done :

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