What causes high BUN and low ALT SGPT?

High BUN and low ALT SGPT can be caused by many reasons.

If your BUN is in between 6 mg/dL and 20 mg/dL and your ALT SGPT is in between 21 U/L and 72 U/L then you need not worry as these are the normal ranges for BUN and ALT SGPT 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	6.062
5-10 years	6.124
10-15 years	6.187
15-20 years	6.251
20-25 years	6.315
25-30 years	6.38
30-35 years	6.446
35-40 years	6.512
40-45 years	6.579
45-50 years	6.647
50-55 years	6.715
55-60 years	6.784
60-70 years	6.854
70-80 years	6.924
80-90 years	6.995
90-100 years	7.067
>100 years	7.14

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

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Normal range of ALT SGPT : 21 - 72 U/L

Ideal values of ALT SGPT depending on age :

Age	Ideal ALT SGPT value
<5 years	21.216
5-10 years	21.434
10-15 years	21.654
15-20 years	21.876
20-25 years	22.101
25-30 years	22.328
30-35 years	22.557
35-40 years	22.789
40-45 years	23.023
45-50 years	23.259
50-55 years	23.498
55-60 years	23.739
60-70 years	23.983
70-80 years	24.229
80-90 years	24.478
90-100 years	24.729
>100 years	24.983

High BUN and low ALT SGPT can be caused by a lot of reasons. If you take BUN and ALT SGPT blood tests and the results are higher than 20 mg/dL for BUN and lower than 21 U/L for ALT SGPT, 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 ALT SGPT Tests Are Done :

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