Is FT3 thyroid 3.3 normal, high or low? What does Free triiodothyronine level 3.3 mean?

📅 Medical Review Date: December 4, 2025

Your FT3 thyroid level of 3.3 is a Normal FT3 thyroid level.

Normal FT3 thyroid levels may indicate underlying health problems. The normal range is typically between 2.3 pg/mL and 4.2 pg/mL. 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 FT3 thyroid range for men is :2.3 - 4.2 pg/mL

Ideal values of FT3 thyroid depending on age (male) :

Age	Ideal FT3 thyroid value
<5 years	2.376
5-10 years	2.454
10-15 years	2.535
15-20 years	2.619
20-25 years	2.705
25-30 years	2.794
30-35 years	2.886
35-40 years	2.981
40-45 years	3.079
45-50 years	3.181
50-55 years	3.286
55-60 years	3.394
60-70 years	3.506
70-80 years	3.622
80-90 years	3.742
90-100 years	3.865
>100 years	3.993

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

Get Advice via Email : Send us your blood test report, and our FT3 thyroid experts will review it. You'll receive a detailed analysis and personalized treatment guidance via email within 12 hours. If you have additional blood test results besides FT3 thyroid, please include those too—an accurate diagnosis often requires a full view of all abnormalities. Upload blood test report now

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Some examples of conditions that increase or decrease FT3 thyroid levels include:

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

Receive world-class medical opinion about your normal FT3 thyroid levels over email.Upload blood test report now

Normal range of FT3 thyroid found among women :2.3-4.2 pg/mL

Ideal values of FT3 thyroid depending on age (female) :

Age	Ideal FT3 thyroid value
<5 years	2.378
5-10 years	2.459
10-15 years	2.543
15-20 years	2.629
20-25 years	2.718
25-30 years	2.81
30-35 years	2.906
35-40 years	3.005
40-45 years	3.107
45-50 years	3.213
50-55 years	3.322
55-60 years	3.435
60-70 years	3.552
70-80 years	3.673
80-90 years	3.798
90-100 years	3.927
>100 years	4.06

If you take a FT3 thyroid blood test and the results are not in the normal range (2.3-4.2 pg/mL), 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 FT3 thyroid Test Is Done :

When your doctor orders a FT3 thyroid test, it involves a straightforward blood draw to measure your FT3 thyroid levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your FT3 thyroid test results are usually available within a few hours.

Medical References

• MedlinePlus – Triiodothyronine (T3) Tests
• Cleveland Clinic – Triiodothyronine (T3) Test: What It Is, Function & Levels
• MedlinePlus – T3 test
• WebMD – T3 Tests: T3 Uptake Levels, Common Thyroid Conditions, and More
• NIH – How to interpret thyroid function tests