What causes high BUN and low FT3 thyroid?

High BUN and low FT3 thyroid can be caused by many reasons.

If your BUN is in between 6 mg/dL and 20 mg/dL and your FT3 thyroid is in between 2.3 pg/mL and 4.2 pg/mL then you need not worry as these are the normal ranges for BUN and FT3 thyroid 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	6.063
5-10 years	6.127
10-15 years	6.191
15-20 years	6.256
20-25 years	6.322
25-30 years	6.388
30-35 years	6.455
35-40 years	6.523
40-45 years	6.591
45-50 years	6.66
50-55 years	6.73
55-60 years	6.801
60-70 years	6.872
70-80 years	6.944
80-90 years	7.017
90-100 years	7.091
>100 years	7.165

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

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Normal range of FT3 thyroid : 2.3 - 4.2 pg/mL

Ideal values of FT3 thyroid depending on age :

Age	Ideal FT3 thyroid value
<5 years	2.324
5-10 years	2.348
10-15 years	2.373
15-20 years	2.398
20-25 years	2.423
25-30 years	2.448
30-35 years	2.474
35-40 years	2.5
40-45 years	2.526
45-50 years	2.552
50-55 years	2.579
55-60 years	2.606
60-70 years	2.633
70-80 years	2.661
80-90 years	2.689
90-100 years	2.717
>100 years	2.746

High BUN and low FT3 thyroid can be caused by a lot of reasons. If you take BUN and FT3 thyroid blood tests and the results are higher than 20 mg/dL for BUN and lower than 2.3 pg/mL for FT3 thyroid, 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 FT3 thyroid Tests Are Done :

If your doctor wants BUN and FT3 thyroid tests on you, you may need to go through these tests. During the BUN and FT3 thyroid 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 FT3 thyroid 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