Differentiating Euthyroid sick syndrome from other diseases

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief:

Overview

Euthyroid sick syndrome must be differentiated from other causes of hypothyroidism on the basis of clinical features and laboratory findings.

Differentiating Euthyroid sick syndrome from other Diseases

Euthyroid sick syndrome must be differentiated from other causes of hypothyroidism on the basis of history and symptoms and laboratory findings:

Disease		History and symptoms			Laboratory findings							Additional findings
		Fever	Goiter	Pain	TSH	Free T4	T3	T3RU	Thyroglobin	TRH	TPOAb
Euthyroid sick syndrome		+	-	-	N/↑	N/↓	↓	-	-	↓	-	Additional findings of underlying condition
Primary hypothyroidism	Autoimmune	+	+/- Diffuse	-	↑	↓	N/↓	Normal	N/↑	Normal	↑	May be accompanied by other autoimmune diseases
	Thyroiditis	+	+/-	+	↑	↓	Normal	Normal	N/↑	Normal	Normal	Infectious thyroiditis associated with neck pain
	Others	-	+/-	-	↑	↓	Normal	Normal	N/↑	Normal	Normal	History of hyperthyroidism Drug history
Transient hypothyroidism		+/-	-	+/-	↑	↑	Normal	Normal	↑	Normal	Normal	May present primarily with hyperthyroidism
Subclinical hypothyroidism		-	-	-	↑	Normal	Normal	Normal	↑	Normal	N/↑	Asymptomatic
Central Hypothyroidism	Pituitary	+	-	-	N/↓	N/↓	N/↓	↓	Normal	Normal	Normal	Other pituitary hormone deficiencies signs
	Hypothalamus	+	-	-				↑	Normal	↓	Normal	Other pituitary hormone deficiencies signs
Resistance to TSH/TRH		-	-	-	↑	N/↓	N/↓	Normal	Normal	↑/↓	Normal	Rare