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

Fasting, starvation, sepsis, trauma, cardiopulmonary bypass, malignancy, heart failure, hypothermia, myocardial infarction, chronic renal failure, cirrhosis, and diabetic ketoacidosis.

• [Disease name] must be differentiated from other diseases that cause [clinical feature 1], [clinical feature 2], and [clinical feature 3], such as [differential dx1], [differential dx2], and [differential dx3].
• [Disease name] must be differentiated from [[differential dx1], [differential dx2], and [differential dx3].

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/↓	↓	-	-	↓	-	Additional symptoms of underlying conditions(s)
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