T4, Free
Methodology
Chemiluminescent immunoassay
Alternate Names
FT4, Free T4, Thyroxine Free
SoftLab Order Code
FT4
Epic Order Name
T4, FREE
Epic Order ID
LAB127
Laboratory
Raleigh
Additional Test Information
Free T4 is susceptible to biotin interference at a concentration of 100 ng/mL
Sample Type
Serum
Collection Container
RST (Orange top - Rapid Serum Tube)
Alternative Collection Container
SST (Gold Top Serum Separator tube)
Red/Black Speckle top (Serum tube)
Collecting Volume
1.0 mL
Minimum Collecting Volume
1.0 mL
Neonatal minimum volume: 900 uL (two full gold top microtainer)
Neonatal minimum volume: 900 uL (two full gold top microtainer)
Storage or Stability
Ambient 8 hours, refrigerated 2 days
Causes for Rejection
QNS
Patient Preparation
Patients taking Biotin should not be tested.
CPT Codes
84439