Is FT4 thyroid 1.72 normal, high or low? What does Free thyroxine level 1.72 mean?

📅 Medical Review Date: September 17, 2025

Your FT4 thyroid level of 1.72 is a Normal FT4 thyroid level.

Normal FT4 thyroid levels may indicate underlying health problems. The normal range is typically between 0.89 ng/dL and 1.76 ng/dL. 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 FT4 thyroid range for men is :0.89 - 1.76 ng/dL

Ideal values of FT4 thyroid depending on age (male) :

Age	Ideal FT4 thyroid value
<5 years	0.905
5-10 years	0.921
10-15 years	0.937
15-20 years	0.953
20-25 years	0.969
25-30 years	0.986
30-35 years	1.003
35-40 years	1.02
40-45 years	1.038
45-50 years	1.056
50-55 years	1.074
55-60 years	1.092
60-70 years	1.111
70-80 years	1.13
80-90 years	1.149
90-100 years	1.169
>100 years	1.189

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

Misdiagnosis is more common than people think—and the consequences can be serious. Delayed treatment, unnecessary medication, or worse. If you want a second opinion on your blood work, one option is to upload it to a site like wholebodyprotocol.com, where world-class doctors review your results. They charge a small fee—around $90 (though you'll want to check the latest price as it fluctuates)—and email you a detailed report. With over 12 million people affected by misdiagnosis every year, that little bit of extra peace of mind can go a long way.

Some examples of conditions that increase or decrease FT4 thyroid levels include:

• Autoimmune disease
• A non-functioning thyroid gland
• Thyroiditis
• Diabetes
• Liver disease

Normal range of FT4 thyroid found among women :0.89-1.76 ng/dL

Ideal values of FT4 thyroid depending on age (female) :

Age	Ideal FT4 thyroid value
<5 years	0.906
5-10 years	0.922
10-15 years	0.938
15-20 years	0.955
20-25 years	0.972
25-30 years	0.989
30-35 years	1.007
35-40 years	1.025
40-45 years	1.043
45-50 years	1.061
50-55 years	1.08
55-60 years	1.099
60-70 years	1.118
70-80 years	1.138
80-90 years	1.158
90-100 years	1.179
>100 years	1.2

If you take a FT4 thyroid blood test and the results are not in the normal range (0.89-1.76 ng/dL), 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 FT4 thyroid Test Is Done :

When your doctor orders a FT4 thyroid test, it involves a straightforward blood draw to measure your FT4 thyroid levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your FT4 thyroid 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
• MedlinePlus – Free T4 test
• WebMD – What Is a Thyroxine (T4) Blood Test?
• Mayo Clinic – Hypothyroidism (underactive thyroid) - Diagnosis and treatment