. 2023 Dec 12;45(2):2293224. doi: 10.1080/0886022X.2023.2293224

Table 1.

Classification of thyroid function.

Thyroid function	FT3	FT4	TSH
Overt hypothyroidism (OH)	`↓`	`↓`	`↑`
Subclinical hypothyroidism (SH)	`→`	`→`	`↑`
LowT3 syndrome (LT3S)	`↓`	`→`	`→`
LowT4 syndrome (LT4S)	`↓/→`	`↓`	`→`

Abbreviations: FT3: serum free T3; FT4: serum free T4.

Reference ranges of FT3, FT4, and TSH were 2.26–4.15 pg/ml, 1.01–1.67 ng/dl, and 0.32–4.12 mIU/ml, respectively.