What causes high FT4 thyroid and low MCHC?

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

If your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL and your MCHC is in between 31.5 g/dL and 34.5 g/dL then you need not worry as these are the normal ranges for FT4 thyroid and MCHC 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	0.91732
5-10 years	0.94548
10-15 years	0.97451
15-20 years	1.00443
20-25 years	1.03527
25-30 years	1.06705
30-35 years	1.09981
35-40 years	1.13357
40-45 years	1.16837
45-50 years	1.20424
50-55 years	1.24121
55-60 years	1.27932
60-70 years	1.3186
70-80 years	1.35908
80-90 years	1.4008
90-100 years	1.4438
>100 years	1.48812

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

Normal range of MCHC : 31.5 - 34.5 g/dL

Ideal values of MCHC depending on age :

Age	Ideal MCHC value
<5 years	32.467
5-10 years	33.464
10-15 years	34.491
15-20 years	34.459
20-25 years	34.427
25-30 years	34.395
30-35 years	34.363
35-40 years	34.331
40-45 years	34.299
45-50 years	34.267
50-55 years	34.235
55-60 years	34.203
60-70 years	34.171
70-80 years	34.139
80-90 years	34.107
90-100 years	34.075
>100 years	34.043

High FT4 thyroid and low MCHC can be caused by a lot of reasons. If you take FT4 thyroid and MCHC blood tests and the results are higher than 1.76 ng/dL for FT4 thyroid and lower than 31.5 g/dL for MCHC, 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 MCHC Tests Are Done :

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