What does a thyroid function test include?

May 13, 2025 Source: Cainiu Health

Dr. Yang Chuanjia

Introduction

In general, thyroid function tests include measurements of thyroid-stimulating hormone (TSH), total triiodothyronine (T3), total thyroxine (T4), free triiodothyronine (FT3), and free thyroxine (FT4). Before and after undergoing thyroid function tests, it is important to follow the doctor's instructions, maintain a healthy lifestyle, and avoid consuming substances that may affect the test results.

Generally, thyroid function tests include measurements of thyroid-stimulating hormone (TSH), total triiodothyronine (TT3), total thyroxine (TT4), free triiodothyronine (FT3), and free thyroxine (FT4). A detailed analysis is as follows:

1. Thyroid-Stimulating Hormone (TSH) Test

This is an initial screening test used to evaluate thyroid function. When patients exhibit symptoms of hyperthyroidism or hypothyroidism, doctors may first recommend this test. Abnormal TSH levels may indicate thyroid dysfunction.

2. Total Triiodothyronine (TT3)

Total triiodothyronine is one of the hormones secreted by the thyroid gland. It is useful for diagnosing early-stage hyperthyroidism and monitoring recurrent hyperthyroidism.

3. Total Thyroxine (TT4)

Total thyroxine is also a hormone secreted by the thyroid gland. Its measurement helps identify hyperthyroidism and differentiate between primary and secondary hypothyroidism.

4. Free Triiodothyronine (FT3)

Free triiodothyronine is one of the hormones responsible for physiological effects. It is highly sensitive for diagnosing hyperthyroidism and serves as a specific indicator for diagnosing T3-type hyperthyroidism.

5. Free Thyroxine (FT4)

Free thyroxine, when measured together with TSH, is commonly used in the diagnosis of suspected thyroid disorders.

Before and after undergoing thyroid function tests, it is important to follow the guidance of a physician, maintain a healthy lifestyle, and avoid consuming substances that may affect test results.

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