Triiodothyronine, Free

Overview

  • EPIC Code:
  • LAB137
  • Soft Test Code:
  • T3FR1
Alternate Names
  • Free T3
  • FT3
  • T3, Free

Specimen Collection & Preparation

Patient Preparation

Patient should discontinue taking Biotin, Vitamin B7, or Vitamin H 48 hours before getting blood drawn.


Specimen Requirements:

-OR-

1.0 mL Serum in a SST Gold Top Tube
Minimum Volume:
0.2 mL Serum*

* This volume does not allow for repeat testing

Transport and Storage:
  • Ambient (18-24°C): 5 Days
  • Refrigerated (2-8°C): 7 Days
  • Frozen (-20° C or colder): 30 Days

Clinical Interpretation

Reference Range:

2.3 - 3.8 pg/mL


Test Comments:

Patients taking vitamin supplements containing high doses of biotin (> 5 mg/day) may have falsely increased test results generated.


Methodology:
  • Chemiluminescence (CL)

Production Schedule

Sites Performed
  • Parkview Regional Medical Center
Days Performed
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Departments
  • Chemistry
Turn Around Time

Same day/next day


Coding & Compliance

CDM

01429879


CPT Coding

84481