What are the three indicators of thyroid function?

May 16, 2023 Source: Cainiu Health

Dr. Pan Yongyuan

Introduction

The three thyroid function tests include thyroid-stimulating hormone (TSH) secreted by the pituitary gland, free T3, and free T4. The normal reference ranges may vary slightly depending on the specific test parameters. The normal ranges are 2 pmol/L–10 mU/L for TSH, 4 pmol/L–10 pmol/L for free T3, and 10 pmol/L–31 pmol/L for free T4.

Thyroid function tests include three items: thyroid-stimulating hormone (TSH) secreted by the pituitary gland, free T3, and free T4. The normal reference ranges may vary slightly depending on the specific test parameters. The details are as follows:

1. Thyroid-stimulating hormone (TSH) secreted by the pituitary gland

The normal range for TSH is 2 pmol/L–10 pmol/L. Secreted by the anterior pituitary gland, TSH promotes the proliferation of thyroid follicular epithelial cells and stimulates the synthesis and secretion of thyroid hormones.

2. Free T3

The normal range for free T3 is 4 pmol/L–10 pmol/L. It is a hormone synthesized and secreted by thyroid follicular cells. Elevated levels are commonly seen in hyperthyroidism and triiodothyronine (T3)-type hyperthyroidism, while the occurrence of typical hyperthyroidism may be relatively lower.

3. Free T4

The normal range for free T4 is 10 pmol/L–31 pmol/L. It is a sensitive indicator that accurately reflects thyroid function.

The three-item thyroid function test is one of the key examinations for evaluating thyroid function, directly indicating whether major thyroid parameters are within the normal range. It can help screen for thyroid disorders such as hyperthyroidism and hypothyroidism. Patients experiencing symptoms should seek medical attention at a hospital promptly for diagnosis and treatment.

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