What causes high Cystatin c and low FT3 thyroid?

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

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

• Impaired kidney function
• Diabetes
• Obstructive sleep apnea
• Metabolic syndrome
• Heart disease

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	0.664
10-15 years	0.687
15-20 years	0.711
20-25 years	0.736
25-30 years	0.762
30-35 years	0.789
35-40 years	0.817
40-45 years	0.846
45-50 years	0.876
50-55 years	0.907
55-60 years	0.939
60-70 years	0.972
70-80 years	1.006
80-90 years	1.005
90-100 years	1.004
>100 years	1.003

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

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	2.38
5-10 years	2.463
10-15 years	2.549
15-20 years	2.638
20-25 years	2.73
25-30 years	2.825
30-35 years	2.924
35-40 years	3.026
40-45 years	3.132
45-50 years	3.241
50-55 years	3.354
55-60 years	3.471
60-70 years	3.592
70-80 years	3.717
80-90 years	3.847
90-100 years	3.981
>100 years	4.12

High Cystatin c and low FT3 thyroid can be caused by a lot of reasons. If you take Cystatin c and FT3 thyroid blood tests and the results are higher than 1.03 mg/L for Cystatin c and lower than 2.3 pg/mL for FT3 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 Cystatin c and FT3 thyroid Tests Are Done :

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

Medical References

• Cleveland Clinic – Estimated Glomerular Filtration Rate (eGFR): Test & Levels
• MedlinePlus – Glomerular Filtration Rate (GFR) Test
• NIH – Serum cystatin C as a marker of renal function in detection of early acute kidney injury
• NIH – Incorporation of Cystatin C Testing in Clinical Practice: Real World Experience in Sweden