This lab test is from Wallach's Interpretation of Diagnostic Tests About our sources
Reverse T3 (rT3), Triiodothyronine, Reverse
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The following is an excerpt....
Definition

Hormonally inactive isomer of T3

Use
  • To distinguish low T3 (“sick thyroid”) patients (usually increased) from true hypothyroidism
Interpretation
  • Normal range
    • 0–6 days ...

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