You should know the normal thyroid levels from the thyroid test results and their significance.
Normal Thyroid Levels & Test Results
Normal Medication | Thyroid Symptoms
Your Doctor may recommend you to undergo thyroid function blood test if you have some thyroid disease symptoms. The blood test for thyroid include the following:
Blood Tests for Thyroid
Thyroid hormone blood tests include Total T4, T3 and free thyroxine (FT4), free thyroxine index (FTI) and free triiodothyronine (FT3).
Normal Thyroid Hormone Levels
The normal values as given in the following table may vary from lab to lab as T4, T3 and TSH are compared to the reference range. The reference range can vary slightly from one hospital or lab to another.
Most healthy people will have results within the range. If the results show borderline levels, it may indicate a borderline disease. For such patients, the TRH (Thyroid-Stimulating Hormone) test can be useful. The TRH test can tell whether a patient has an underactive, overactive, normal thyroid.
Thyroid Hormone Levels
| Hormone Test | Adults | Babies and Children | Newborns (1 to 14 days of old) |
| Normal Thyroid levels | |||
| Total thyroxine (T4) mcg/dL | 5–14 | 5.6–16.6 | 9.8–22.6 |
| Total triiodothyronine (T3) ng/dL | 80–230 | 83–280 | 32–250 |
| Free thyroxine Index (FTI) | 4.2–13.0 | 5.0–12.8 | 7.5–17.5 |
| Free thyroxine (FT4) ng/dL | 0.8–2.4 | ||
| Free triiodothyronine (FT3) ng/dL | 0.2–0.6 | ||
| Thyroid-stimulating hormone (TSH) mU/L | 0.4–4.5 | 3–18 | |
Low TSH value indicates an excess of thyroid hormone in the blood, as in hyperthyroidism, while high value indicates little thyroid hormone, as in hypothyroidism.
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The content on this website is reviewed regularly and is updated when new information is made available. The information provided is neither intended nor implied to be a substitute for professional medical advice. You should always seek the advice of your Doctor.
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