What causes high FT4 thyroid and low Packed cell volume?

High FT4 thyroid and low Packed cell volume can be caused by many reasons.

If your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL and your Packed cell volume is in between 41 % and 49.5 % then you need not worry as these are the normal ranges for FT4 thyroid and Packed cell volume 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	0.92222
5-10 years	0.9556
10-15 years	0.99019
15-20 years	1.02603
20-25 years	1.06317
25-30 years	1.10166
30-35 years	1.14154
35-40 years	1.18286
40-45 years	1.22568
45-50 years	1.27005
50-55 years	1.31603
55-60 years	1.36367
60-70 years	1.41303
70-80 years	1.46418
80-90 years	1.51718
90-100 years	1.5721
>100 years	1.62901

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

Normal range of Packed cell volume : 41 - 49.5 %

Ideal values of Packed cell volume depending on age :

Age	Ideal Packed cell volume value
<5 years	42.484
5-10 years	44.022
10-15 years	45.616
15-20 years	47.267
20-25 years	48.978
25-30 years	48.914
30-35 years	48.85
35-40 years	48.786
40-45 years	48.722
45-50 years	48.658
50-55 years	48.594
55-60 years	48.53
60-70 years	48.467
70-80 years	48.404
80-90 years	48.34
90-100 years	48.277
>100 years	48.214

High FT4 thyroid and low Packed cell volume can be caused by a lot of reasons. If you take FT4 thyroid and Packed cell volume blood tests and the results are higher than 1.76 ng/dL for FT4 thyroid and lower than 41 % for Packed cell volume, 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 Packed cell volume Tests Are Done :

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