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HelpTest Code T3F TRIIODOTHYRONINE (T3), FREE, SERUM
Performing Laboratory
NorDx Laboratories
Useful For
Diagnosing hyperthyroidism and clarification of thyroid status in the presence of a possible protein binding abnormality
Method Name
Electrochemiluminescent Immunoassay (ECLIA)
Reference Values
0-19 years: 1.5 – 6.4 pg/mL
(Reference ranges for infants and children are suggested ranges)
>19 years: 2.3-4.2 pg/mL
Days and Times Test Performed
Monday through Sunday
Report Available
1 Day
Specimen Type
Serum
Preferred Container
Serum Separator Tube (SST)
Preferred Volume
Serum: 1 mL (Serum Separator Tube (SST))
Minimum Volume
Serum: 0.5 mL (Serum Separator Tube (SST))
Specimen Collection and Handling
1. Spin specimen, separate from clot and send refrigerated.
2. Sample should not be collected on patients receiving therapy with high biotin doses (i.e. >5 mg/day) until at least 8 hours after the last biotin administration.
Specimen Stability Information
Specimen Type: Serum
Frozen: 1 Month
Refrigerated: 7 Days
Must be spun/separated within: 2 Hours
Add On Capable
Yes
Advance Beneficiary Notice Requirements
No ABN Required
CPT Code Information
|
CPT Code |
CPT Description |
CPT Disclaimer |
|---|---|---|
| 84481 | Triidothyronine T3, Free, Quantitative |
Performing Laboratory Location
NorDx Laboratories
LOINC Code Information
14928-6
Keywords
FREE T3 (TRIIODOTHYRONINE)
FREE TRIIODOTHYRONINE
FT3 (FREE TRIIODOTHYRONINE)
TRIIODOTHYRONINE
Acceptable Alternative Container(s)
Plasma Separator Tube (PST)
Red Top Tube
Orange Top Tube (Rapid clot serum)