What causes high HbA1c and low FT4 thyroid?

High HbA1c and low FT4 thyroid can be caused by many reasons.

If your HbA1c is in between 4 % and 5.7 % and your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL then you need not worry as these are the normal ranges for HbA1c and FT4 thyroid 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 HbA1c : 4 - 5.7 %

Ideal values of HbA1c depending on age :

Age	Ideal HbA1c value
<5 years	4.04
5-10 years	4.08
10-15 years	4.121
15-20 years	4.162
20-25 years	4.204
25-30 years	4.246
30-35 years	4.288
35-40 years	4.331
40-45 years	4.374
45-50 years	4.418
50-55 years	4.462
55-60 years	4.507
60-70 years	4.552
70-80 years	4.598
80-90 years	4.644
90-100 years	4.69
>100 years	4.737

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

If you want your blood test report to be interpreted by HbA1c specialist, then you can upload your report. Our HbA1c 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

HbA1c treatment - Click to read 10 GOLDEN ARTICLES on Diabetes

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If you want your blood test report to be interpreted by HbA1c specialist, you can upload your report. Our HbA1c 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 FT4 thyroid : 0.89 - 1.76 ng/dL

Ideal values of FT4 thyroid depending on age :

Age	Ideal FT4 thyroid value
<5 years	0.8989
5-10 years	0.90789
10-15 years	0.91697
15-20 years	0.92614
20-25 years	0.9354
25-30 years	0.94475
30-35 years	0.9542
35-40 years	0.96374
40-45 years	0.97338
45-50 years	0.98311
50-55 years	0.99294
55-60 years	1.00287
60-70 years	1.0129
70-80 years	1.02303
80-90 years	1.03326
90-100 years	1.04359
>100 years	1.05403

High HbA1c and low FT4 thyroid can be caused by a lot of reasons. If you take HbA1c and FT4 thyroid blood tests and the results are higher than 5.7 % for HbA1c and lower than 0.89 ng/dL for FT4 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 HbA1c and FT4 thyroid Tests Are Done :

If your doctor wants HbA1c and FT4 thyroid tests on you, you may need to go through these tests. During the HbA1c and FT4 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 HbA1c and FT4 thyroid Test reports by your pathologist.

Medical References

• MedlinePlus – Hemoglobin A1C (HbA1c) Test
• NIH – The A1C Test & Diabetes
• Mayo Clinic – A1C test