Reverse T3 (rT3), Triiodothyronine, Reverse



Definition

  • Hormonally inactive isomer of T3.

  • Normal range:

    • Birth to 6 days: 600–2,500 pg/mL

    • ≥7 days: 90–350 pg/mL

Use

  • To distinguish low T3 “sick thyroid” patients (usually increased) from true h...

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