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0070133
Triiodothyronine, Free (Free T3)
FT3
Ordering Recommendation
Not recommended for routine thyroid screening; for initial thyroid disorder screening, refer to Thyroid Stimulating Hormone (0070145).
New York DOH Approval Status
This test is New York state approved.
Specimen Required
Patient Preparation
Collect
Serum separator tube or plasma separator tube. Also acceptable: Lavender (K3EDTA or K2EDTA ) or pink (K2EDTA), Green (lithium heparin)
Specimen Preparation
Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)
Storage/Transport Temperature
Refrigerated.
Unacceptable Conditions
Grossly hemolyzed specimens.
Remarks
Stability
After separation from cells: Ambient: 5 days; Refrigerated: 1 week; Frozen: 1 month
Methodology
Quantitative Electrochemiluminescent Immunoassay
Performed
Sun-Sat
Reported
Within 24 hours
Reference Interval
Effective February 22, 2022
| 0-3 days | 2.0-7.9 pg/mL |
| 4-30 days | 2.0-5.2 pg/mL |
| 1-24 months | 1.6-6.4 pg/mL |
| 2-6 years | 2.0-6.0 pg/mL |
| 7-11 years | 2.7-5.2 pg/mL |
| 12-19 years | 2.3-5.0 pg/mL |
| 20 years and older | 2.5-4.3 pg/mL |
Interpretive Data
Compliance Category
FDA
Note
Hotline History
N/A
CPT Codes
84481
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0070133 | Triiodothyronine, Free (Free T3) | 3051-0 |
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
- 3, Free, Serum
- Free T3
- Free T3 Only, S
- Free Triiodothyronine
- FT3
- T3, Free
Triiodothyronine, Free (Free T3)
