What causes high FT3 thyroid and low Cystatin c?

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

If your FT3 thyroid is in between 2.3 pg/mL and 4.2 pg/mL and your Cystatin c is in between 0.62 mg/L and 1.03 mg/L then you need not worry as these are the normal ranges for FT3 thyroid and Cystatin c 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 FT3 thyroid : 2.3 - 4.2 pg/mL

Ideal values of FT3 thyroid depending on age :

Age	Ideal FT3 thyroid value
<5 years	2.383
5-10 years	2.469
10-15 years	2.558
15-20 years	2.65
20-25 years	2.745
25-30 years	2.844
30-35 years	2.946
35-40 years	3.052
40-45 years	3.162
45-50 years	3.276
50-55 years	3.394
55-60 years	3.516
60-70 years	3.642
70-80 years	3.773
80-90 years	3.908
90-100 years	4.048
>100 years	4.193

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

If you want your blood test report to be interpreted by FT3 thyroid specialist, then you can upload your report. Our FT3 thyroid expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours. Upload blood test report now

1,37,160

Total number of patients treated

Some examples of conditions that increase or decrease FT3 thyroid levels include:

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

If you want your blood test report to be interpreted by FT3 thyroid specialist, you can upload your report. Our FT3 thyroid expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours. Upload blood test report now

Normal range of Cystatin c : 0.62 - 1.03 mg/L

Ideal values of Cystatin c depending on age :

Age	Ideal Cystatin c value
<5 years	0.642
5-10 years	0.665
10-15 years	0.689
15-20 years	0.714
20-25 years	0.74
25-30 years	0.767
30-35 years	0.795
35-40 years	0.824
40-45 years	0.854
45-50 years	0.885
50-55 years	0.917
55-60 years	0.95
60-70 years	0.984
70-80 years	1.019
80-90 years	1.018
90-100 years	1.017
>100 years	1.016

High FT3 thyroid and low Cystatin c can be caused by a lot of reasons. If you take FT3 thyroid and Cystatin c blood tests and the results are higher than 4.2 pg/mL for FT3 thyroid and lower than 0.62 mg/L for Cystatin c, 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 FT3 thyroid and Cystatin c Tests Are Done :

If your doctor wants FT3 thyroid and Cystatin c tests on you, you may need to go through these tests. During the FT3 thyroid and Cystatin c 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 FT3 thyroid and Cystatin c Test reports by your pathologist.

Medical References

• MedlinePlus – Triiodothyronine (T3) Tests
• Cleveland Clinic – Triiodothyronine (T3) Test: What It Is, Function & Levels
• MedlinePlus – T3 test
• WebMD – T3 Tests: T3 Uptake Levels, Common Thyroid Conditions, and More
• NIH – How to interpret thyroid function tests