Methodology
Equilibrium Dialysis; Chromatography/Mass Spectrometry
Synonyms
Free T4 by Equilibrium Dialysis; Thyroxin, Free by Direct Dialysis; Direct Free T4; Free T4 Direct Dialysis; FT4 Direct Dialysis; Free Thyroxine
Specimen Type
Serum
Performing Lab
Quest Diagnostics San Juan Capistrano
Epic ID
LAB01063
Lab Test Days
Monday-Saturday
Standard TAT
3-4 Days
Collection Information
Specimen Required
1-2 mL Blood
Container Type
Red Top (No Additive)
Collection Instructions
Fasting is preferred.
Processing Information - Lab Use Only
Transport Temperature
Refrigerate-OK/Frozen-OK
Specimen Stability
Room Temp: 4 Days; Refrigerated: 14 Days; Frozen: 35 Days
Rejection Criteria
Lipemia; Heparin plasma; EDTA plasma
Test Volume Required
1 mL Serum
Minimum Test Volume
0.5 mL Serum
CPT Codes
84439
Revised
02-25-18
Initials
SL