- Test Name
- Free thyroxine
- Aliases
- FT4; Free T4
- Provincial Mnemonic
- T4FR
- LOINC Test Code
- 14920-3
- Description and Primary Use
- Investigation of thyroid function disorders
- Reorder interval
- 28d
- TAT
- ≤ 3d
- Test Cost
- Not determined
- Tier
- 1 - General Availability
- Ordering Requirements (Restrictions / Conditions)
No Restrictions
- Required Consultations
- None
- Algorithms and Guidelines
- Special Patient Preparation
At leat 12 hours prior this test, no multivitamins or dietary supplements containing biotin or vitamin B7, which are commonly found in hair, skin, and nail supplements and multivitamins
- Special Collection / Transport / Processing Requirements
No special requirements.
- Criteria for Rejection
Based on specimen condition and stability
- Laboratory Service Area
- Clinical Chemistry
- Performing Laboratory / Site
- Selected Category 2, Category 3 and Category 4 laboratory sites
- Last Updated
- 11-Sep-17