What causes high BUN and low HbA1c?

High BUN and low HbA1c can be caused by many reasons.

If your BUN is in between 6 mg/dL and 20 mg/dL and your HbA1c is in between 4 % and 5.7 % then you need not worry as these are the normal ranges for BUN and HbA1c 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	6.061
5-10 years	6.123
10-15 years	6.185
15-20 years	6.248
20-25 years	6.312
25-30 years	6.376
30-35 years	6.441
35-40 years	6.507
40-45 years	6.573
45-50 years	6.64
50-55 years	6.708
55-60 years	6.776
60-70 years	6.845
70-80 years	6.915
80-90 years	6.985
90-100 years	7.056
>100 years	7.128

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

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Normal range of HbA1c : 4 - 5.7 %

Ideal values of HbA1c depending on age :

Age	Ideal HbA1c value
<5 years	4.041
5-10 years	4.082
10-15 years	4.124
15-20 years	4.166
20-25 years	4.208
25-30 years	4.251
30-35 years	4.294
35-40 years	4.338
40-45 years	4.382
45-50 years	4.427
50-55 years	4.472
55-60 years	4.517
60-70 years	4.563
70-80 years	4.609
80-90 years	4.656
90-100 years	4.703
>100 years	4.751

High BUN and low HbA1c can be caused by a lot of reasons. If you take BUN and HbA1c blood tests and the results are higher than 20 mg/dL for BUN and lower than 4 % for HbA1c, 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 HbA1c Tests Are Done :

If your doctor wants BUN and HbA1c tests on you, you may need to go through these tests. During the BUN and HbA1c 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 HbA1c 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