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Thyroid Function Test – Purpose, Procedure and Reading

What Is a Thyroid Function Test?

What Is the Procedure of Performing a Thyroid Function Test?

How to Prepare for a Thyroid Test?

How to Read a Thyroid Function Test Report?

If you are curious about the interpretation of thyroid function test and its reading, it is mainly expressed in terms of the high or low presence of these hormones in the blood. The following table represents the average values of the thyroid function test.

Thyroid Test

Normal Range

Thyroid Stimulating Hormone

0.40-4.50 mIU/mL (milli-international units per litre of blood)

Thyroxine

5.0-11.0 ug/dL (micrograms per deciliter of blood)

Free thyroxine

0.9-1.7 ng/dL (nanograms per deciliter of blood)

Triiodothyronine

100-200 ng/dL (nanograms per deciliter of blood)

Free triiodothyronine

2.3-4.1 pg/mL (picograms per millilitre of blood)

Following this, a high level of T4, which is higher than 5.0-11.0 ug/dL, can cause hyperthyroidism. On the other hand, a TSH measure reading of more than 4.50 mIU/mL indicates a possibility of hypothyroidism. If your TSH is lower than 0.40 mIU/mL, you might face the risk of hyperthyroidism.

The doctors usually order a T3 test if your T4 and TSH tests suggest hyperthyroidism. If your T3 levels are abnormally higher than 100-200 ng/dL, it indicates that you might have a condition called Grave’s disease.

Do You Need to Take a Thyroid Test?

When to See a Doctor?

Frequently Asked Questions