Abnormal Thyroid Function Laboratory Results Caused by Selective Serotonin Reuptake Inhibitor (SSRI) Antidepressant Treatment

Table 1

Summary of thyroid biochemical results.

	Dec. 26, 2020	July 2, 2021	April 5, 2022	April 15, 2022	Sept. 22, 2022	Oct. 24, 2022	Nov. 24, 2022
TSH (0.55-4.78 uIU/mL)		0.04	0.04	0.07	0.63	0.46	0.42
TSH (0.282-4.0 uIU/mL)	0.482
TT4 (3.2-1236 ug/dL)				8.8	8.4	7.3	8.7
fT4 (0.8-1.8 ng/dL)				1.1	1.1	1.1	1.2
TT3 (76-181 ng/dL)	94			81	87	82	76
fT3 (2.3-4.2 pg/L)						2.9	2.9
TSI (<140%)				<89	<89	<89	<89
AntiTPO (<9 IU/mL)				<1	<1		<1
AntiTG (<1 IU/mL)				<1	<1		<1
Antidepressant pharmacotherapy	None	←------------------------------------------------→			←--------------------------------------------------→
		Fluoxetine 20 mg/d			Venlafaxine 37.5 mg/d

Abbreviations: TSH: thyroid stimulating hormone; TT4: total thyroxine; fT4: free thyroxine; TT3: total triiodothyronine; fT3: free triiodothyronine; TSI: thyroid stimulating immunoglobulin; AntiTPO: antithyroperoxidase; AntiTG: antithyroglobulin.