What causes high FT4 thyroid and low BUN?

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

If your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL and your BUN is in between 6 mg/dL and 20 mg/dL then you need not worry as these are the normal ranges for FT4 thyroid and BUN respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Some examples of conditions that can increase or decrease FT4 thyroid levels include:

• Autoimmune disease
• A non-functioning thyroid gland
• Thyroiditis
• Diabetes
• Liver disease

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	0.92035
5-10 years	0.95173
10-15 years	0.98418
15-20 years	1.01774
20-25 years	1.05244
25-30 years	1.08833
30-35 years	1.12544
35-40 years	1.16382
40-45 years	1.20351
45-50 years	1.24455
50-55 years	1.28699
55-60 years	1.33088
60-70 years	1.37626
70-80 years	1.42319
80-90 years	1.47172
90-100 years	1.52191
>100 years	1.57381

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

Normal range of BUN : 6 - 20 mg/dL

Ideal values of BUN depending on age :

Age	Ideal BUN value
<5 years	6.205
5-10 years	6.417
10-15 years	6.636
15-20 years	6.862
20-25 years	7.096
25-30 years	7.338
30-35 years	7.588
35-40 years	7.847
40-45 years	8.115
45-50 years	8.392
50-55 years	8.678
55-60 years	8.974
60-70 years	9.28
70-80 years	9.596
80-90 years	9.923
90-100 years	10.261
>100 years	10.611

High FT4 thyroid and low BUN can be caused by a lot of reasons. If you take FT4 thyroid and BUN blood tests and the results are higher than 1.76 ng/dL for FT4 thyroid and lower than 6 mg/dL for BUN, 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 FT4 thyroid and BUN Tests Are Done :

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

Medical References

• MedlinePlus – Thyroxine (T4) Test
• Cleveland Clinic – T4 (Thyroxine) Test: What It Is, Function, Purpose & Levels
• MedlinePlus – Free T4 test
• WebMD – What Is a Thyroxine (T4) Blood Test?
• Mayo Clinic – Hypothyroidism (underactive thyroid) - Diagnosis and treatment