How to interpret a five-item thyroid function test report
Oct 26, 2023
Source: Cainiu Health
Dr. Zhang Renling
Introduction
The thyroid function panel (five-item test) primarily evaluates whether the following indicators are within normal ranges: triiodothyronine (T3), free triiodothyronine (FT3), thyroxine (T4), free thyroxine (FT4), and thyroid-stimulating hormone (TSH). Note that a single laboratory result generally has limited clinical diagnostic value. If abnormal thyroid function is detected, it is important to seek timely medical evaluation at a hospital and receive treatment under the guidance of a physician.
The thyroid function five-item test report primarily evaluates whether the following indicators are within normal ranges: triiodothyronine, free triiodothyronine, thyroxine, free thyroxine, and thyroid-stimulating hormone (TSH). Specific analyses are as follows:
1. Triiodothyronine (T3): Reference range 0.6–1.81 ng/mL. T3 is the most sensitive indicator for diagnosing hyperthyroidism.
2. Free triiodothyronine (FT3): Reference range 3.5–6.5 pmol/L. FT3 is highly sensitive for diagnosing hyperthyroidism.
3. Thyroxine (T4): Reference range 45–109 ng/mL. This is the most basic in vitro screening method for assessing thyroid function status.
4. Free thyroxine (FT4): Reference range 11.5–22.7 pmol/L. FT4 is a sensitive indicator in in vitro thyroid function tests and can accurately reflect thyroid function even when plasma thyroid-binding protein binding capacity and concentration are altered due to physiological or pathological conditions.
5. Thyroid-stimulating hormone (TSH): Reference range 0.35–5.5 μIU/mL. TSH testing is useful for screening congenital hypothyroidism and evaluating conditions such as hyperprolactinemia.
Note: A single laboratory result generally has limited clinical diagnostic value. If thyroid dysfunction is suspected, it is important to seek timely medical evaluation and receive appropriate treatment under the guidance of a physician.
