Euthyroid sick syndrome laboratory findings

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

Overview

• An elevated/reduced concentration of serum/blood/urinary/CSF/other [lab test] is diagnostic of [disease name].
• Laboratory findings consistent with the diagnosis of [disease name] include [abnormal test 1], [abnormal test 2], and [abnormal test 3].
• [Test] is usually normal among patients with [disease name].
• Some patients with [disease name] may have elevated/reduced concentration of [test], which is usually suggestive of [progression/complication].

OR

• There are no diagnostic laboratory findings associated with [disease name].

Laboratory Findings

Laboratory findings consistent with the diagnosis of euthyroid sick syndrome include:

Euthyroid sick syndrome	Laboratory test
Mild euthyroid sick syndrome	Low T3 Normal T4 Normal fT4 Normal TSH Elevated reverse T3
Moderate euthyroid sick syndrome	Low T3 Normal T4 Normal to elevated fT4 Normal to elevated TSH Elevated reverse T3
Severe euthyroid sick syndrome	Low T3 Low T4 Low TSH Normal to low fT4 Elevated reverse T3