Thyrotoxicosis after COVID-19 Infection with a Delay in Graves’ Disease Antibody Positivity

Table 1

Laboratory thyroid function tests.

	Reference range	# Weeks from COVID-19
		4	7	11	12
TSH (mIU/L)	0.35–4.70	0.004	1.180	<0.002	<0.002
Free T4 (ng/dL)	0.7–1.9	1.2	0.8	2.1	1.3
Total T4 (mcg/dL)	4.5–12.0	8.7	4.2	13.7
Free T3 (pg/mL)	2.8–4.4	2.8		6.5	3.9
Total T3 (ng/dL)	79–149	92.8	68.4	167.0	120
TRAb (IU/L)	0–1.75		1.20		2.50
TSI (IU/L)	0–0.55	0.16		0.58
TPO Ab (IU/mL)	0.0–9.0			<10	18

TSH = thyroid-stimulating hormone; TRAB = thyrotropin receptor antibody; TSI = thyroid-stimulating immunoglobulin; TPO = thyroid peroxidase. Abnormal values are in bold.