What causes high BUN and low Prothrombin time?

High BUN and low Prothrombin time can be caused by many reasons.

If your BUN is in between 6 mg/dL and 20 mg/dL and your Prothrombin time is in between 12 seconds and 16 seconds then you need not worry as these are the normal ranges for BUN and Prothrombin time 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	6.129
10-15 years	6.194
15-20 years	6.26
20-25 years	6.327
25-30 years	6.395
30-35 years	6.463
35-40 years	6.532
40-45 years	6.602
45-50 years	6.673
50-55 years	6.744
55-60 years	6.816
60-70 years	6.889
70-80 years	6.963
80-90 years	7.037
90-100 years	7.112
>100 years	7.188

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

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Normal range of Prothrombin time : 12 - 16 seconds

Ideal values of Prothrombin time depending on age :

Age	Ideal Prothrombin time value
<5 years	12.128
5-10 years	12.258
10-15 years	12.389
15-20 years	12.521
20-25 years	12.655
25-30 years	12.79
30-35 years	12.927
35-40 years	13.065
40-45 years	13.205
45-50 years	13.346
50-55 years	13.489
55-60 years	13.633
60-70 years	13.779
70-80 years	13.926
80-90 years	14.075
90-100 years	14.225
>100 years	14.377

High BUN and low Prothrombin time can be caused by a lot of reasons. If you take BUN and Prothrombin time blood tests and the results are higher than 20 mg/dL for BUN and lower than 12 seconds for Prothrombin time, 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 Prothrombin time Tests Are Done :

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