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HelpT4 (Thyroxine), Free
Performing Lab(s)
Memorial-Belleville & Memorial-Shiloh
Specimen Requirement (s)
Specimen: plasma (preferred) or serum
Type: Container/Tube: Mint green (LiHep) tube (preferred), SST (gold or marble) or plain red top
Specimen Volume: 2 mL
Specimen Minimum Volume: 1 mL of plasma
Collection Instructions: NA
Lab instructions: NA
Unacceptable Conditions
- Avoid Hemolysis.
Day(s)/Shift(s) Test Set Up and Turnaround Time
Sunday through Saturday
Hours: 24 hours
Turnaround Time:
STAT: 60 minutes
Routine: less than 8 hours from receipt
Transport and Stability
Transport temperature: Ambient to lab
Reference Values
T4, Free
|
Age |
Reference Values |
|
0 – 4 days |
1 – 3 ng/dL |
|
4 days – 30 days |
0.8 – 2.2 ng/dL |
|
>30 days |
0.9 – 1.7 ng/dL |
CPT/LOINC Codes
84439