What causes high FT4 thyroid and low ESR?

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

If your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL and your ESR is in between 0.1 mm/hr and 14 mm/hr then you need not worry as these are the normal ranges for FT4 thyroid and ESR 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	0.91812
5-10 years	0.94713
10-15 years	0.97706
15-20 years	1.00794
20-25 years	1.03979
25-30 years	1.07265
30-35 years	1.10655
35-40 years	1.14152
40-45 years	1.17759
45-50 years	1.2148
50-55 years	1.25319
55-60 years	1.29279
60-70 years	1.33364
70-80 years	1.37578
80-90 years	1.41925
90-100 years	1.4641
>100 years	1.51037

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

Normal range of ESR : 0.1 - 14 mm/hr

Ideal values of ESR depending on age :

Age	Ideal ESR value
<5 years	2.063
5-10 years	2.128
10-15 years	2.195
15-20 years	2.264
20-25 years	2.336
25-30 years	2.41
30-35 years	2.486
35-40 years	2.565
40-45 years	2.646
45-50 years	2.73
50-55 years	2.816
55-60 years	2.905
60-70 years	2.997
70-80 years	3.092
80-90 years	3.19
90-100 years	3.291
>100 years	3.395

High FT4 thyroid and low ESR can be caused by a lot of reasons. If you take FT4 thyroid and ESR blood tests and the results are higher than 1.76 ng/dL for FT4 thyroid and lower than 0.1 mm/hr for ESR, 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 ESR Tests Are Done :

If your doctor wants FT4 thyroid and ESR tests on you, you may need to go through these tests. During the FT4 thyroid and ESR 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 ESR 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