Thyroxine, Free

Overview

  • EPIC Code:
  • LAB127
  • Soft Test Code:
  • T4FRE
Alternate Names
  • Free T4
  • FT4
  • T4 Free
  • T4, Free

Specimen Collection & Preparation

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:

0.8 - 1.8 ng/dL


Test Comments:

This assay utilizes biotin technology. 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 DeKalb Hospital
  • Parkview Huntington Hospital
  • Parkview Randallia Hospital
  • Parkview Regional Medical Center
  • Parkview Wabash Hospital
  • Parkview Whitley Hospital
Days Performed
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Departments
  • Chemistry
Turn Around Time

Same day/next day


Coding & Compliance

CDM

01425211


CPT Coding

84439


Medical Necessity May Apply