Is FT3 thyroid 3.7 normal, high or low? What does Free triiodothyronine level 3.7 mean?

📅 Medical Review Date: September 15, 2025

Your FT3 thyroid level of 3.7 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	2.385
5-10 years	2.473
10-15 years	2.565
15-20 years	2.66
20-25 years	2.758
25-30 years	2.86
30-35 years	2.966
35-40 years	3.076
40-45 years	3.19
45-50 years	3.308
50-55 years	3.43
55-60 years	3.557
60-70 years	3.689
70-80 years	3.825
80-90 years	3.967
90-100 years	4.114
>100 years	4.108

*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	2.388
5-10 years	2.479
10-15 years	2.573
15-20 years	2.671
20-25 years	2.773
25-30 years	2.879
30-35 years	2.989
35-40 years	3.103
40-45 years	3.221
45-50 years	3.344
50-55 years	3.471
55-60 years	3.603
60-70 years	3.74
70-80 years	3.883
80-90 years	4.031
90-100 years	4.185
>100 years	4.178

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