What causes high FT4 thyroid and low CRP?

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

If your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL and your CRP is in between 0.1 mg/L and 3 mg/L then you need not worry as these are the normal ranges for FT4 thyroid and CRP 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	0.92142
5-10 years	0.95395
10-15 years	0.98762
15-20 years	1.02248
20-25 years	1.05857
25-30 years	1.09594
30-35 years	1.13463
35-40 years	1.17468
40-45 years	1.21615
45-50 years	1.25908
50-55 years	1.30353
55-60 years	1.34954
60-70 years	1.39718
70-80 years	1.4465
80-90 years	1.49756
90-100 years	1.55042
>100 years	1.60515

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

Normal range of CRP : 0.1 - 3 mg/L

Ideal values of CRP depending on age :

Age	Ideal CRP value
<5 years	0.11388
5-10 years	0.1179
10-15 years	0.12206
15-20 years	0.12637
20-25 years	0.13083
25-30 years	0.13545
30-35 years	0.14023
35-40 years	0.14518
40-45 years	0.1503
45-50 years	0.15561
50-55 years	0.1611
55-60 years	0.16679
60-70 years	0.17268
70-80 years	0.17878
80-90 years	0.18509
90-100 years	0.19162
>100 years	0.19838

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

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