What causes high BUN and low FT4 thyroid?

High BUN and low FT4 thyroid can be caused by many reasons.

If your BUN is in between 6 mg/dL and 20 mg/dL and your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL then you need not worry as these are the normal ranges for BUN and FT4 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 FT4 thyroid : 0.89 - 1.76 ng/dL

Ideal values of FT4 thyroid depending on age :

Age	Ideal FT4 thyroid value
<5 years	0.89935
5-10 years	0.90879
10-15 years	0.91833
15-20 years	0.92797
20-25 years	0.93771
25-30 years	0.94756
30-35 years	0.95751
35-40 years	0.96756
40-45 years	0.97772
45-50 years	0.98799
50-55 years	0.99836
55-60 years	1.00884
60-70 years	1.01943
70-80 years	1.03013
80-90 years	1.04095
90-100 years	1.05188
>100 years	1.06292

High BUN and low FT4 thyroid can be caused by a lot of reasons. If you take BUN and FT4 thyroid blood tests and the results are higher than 20 mg/dL for BUN and lower than 0.89 ng/dL for FT4 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 FT4 thyroid Tests Are Done :

If your doctor wants BUN and FT4 thyroid tests on you, you may need to go through these tests. During the BUN and FT4 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 FT4 thyroid Test reports by your pathologist.