What is the normal range for free T4 and TSH?

Normal Results for T4 test

A typical normal range is 4.5 to 11.2 micrograms per deciliter (mcg/dL).

Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens.

Normal Results for TSH test

Normal values can range from 0.4 - 4.0 mIU/L (milli-international units per liter), depending on:

Your symptoms
Results of other thyroid lab tests
Whether you are already being treated for thyroid problems

Even without signs or symptoms of an underactive thyroid (hypothyroidism), you will need to be followed closely by your doctor if your TSH level is over 3.5 mIU/L but your T4 test is normal (called subclinical hypothyroidism).

If you are being treated for a thyroid disorder, your TSH level should be between 0.5 and 2.0 mIU/L.

The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples.Talk to your doctor about the meaning of your specific test results.

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If you levels are within the normal range then there is no need to take extra medicines/supplements.