Is Free Thyroxine Index 4.7 normal, high or low? What does Free Thyroxine Index level 4.7 mean?

📅 Medical Review Date: February 19, 2026

Your Free Thyroxine Index level of 4.7 is a Normal Free Thyroxine Index level.

Normal Free Thyroxine Index levels may indicate underlying health problems. The normal range is typically between 1.2 Index and 4.9 Index. If your levels are outside this range, it's important to speak with a healthcare provider. Consulting a doctor is recommended to determine the cause and appropriate next steps.

The normal Free Thyroxine Index range for men is :1.2 - 4.9 Index

Ideal values of Free Thyroxine Index depending on age (male) :

Age	Ideal Free Thyroxine Index value
<5 years	1.256
5-10 years	1.315
10-15 years	1.377
15-20 years	1.442
20-25 years	1.51
25-30 years	1.581
30-35 years	1.655
35-40 years	1.733
40-45 years	1.814
45-50 years	1.899
50-55 years	1.988
55-60 years	2.081
60-70 years	2.179
70-80 years	2.281
80-90 years	2.388
90-100 years	2.5
>100 years	2.618

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

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Normal range of Free Thyroxine Index found among women :1.2-4.9 Index

Ideal values of Free Thyroxine Index depending on age (female) :

Age	Ideal Free Thyroxine Index value
<5 years	1.258
5-10 years	1.319
10-15 years	1.383
15-20 years	1.45
20-25 years	1.52
25-30 years	1.594
30-35 years	1.671
35-40 years	1.752
40-45 years	1.837
45-50 years	1.926
50-55 years	2.019
55-60 years	2.117
60-70 years	2.219
70-80 years	2.326
80-90 years	2.439
90-100 years	2.557
>100 years	2.681

If you take a Free Thyroxine Index blood test and the results are not in the normal range (1.2-4.9 Index), your physician may recommend more tests to figure out the problem. You might also get this test if your physician thinks you have some other disease.

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How the Free Thyroxine Index Test Is Done :

When your doctor orders a Free Thyroxine Index test, it involves a straightforward blood draw to measure your Free Thyroxine Index levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your Free Thyroxine Index test results are usually available within a few hours.

Medical References

• MedlinePlus – Thyroxine (T4) Test
• Cleveland Clinic – T4 (Thyroxine) Test: What It Is, Function, Purpose & Levels
• PMC – Free Thyroxine Index
• NIH – Thyroid Function Tests