Test ID: Z4125
CPT code: 84482
LOINC: 3052-8
Specimen Type: SST or RED
Frequency: 4 – 6 days
Instructions: 1 mL Serum from Red or SST, Ambient. Min 0.6 mL.
Text: In acutely ill patients (after acute MI or other patients in intensive care), an elevated rT3 level has been found to independently predict increased mortality. Significant changes in rT3 occur rapidly in acute illness with maximal changes 24 – 36 hours after the onset of symptoms.
Methodology: Liquid chromatography/tandem mass spectrometry (LC/MS-MS)