Testing Laboratory
Auckland Te Toka Tumai | Auckland HospitalDepartment
Chemical Pathology
Delphic Registration Code (Alpha Code)
FT4
Test Code (Numeric Code)
3024
Laboratory Handling
Sample Stability
5 days at 20 - 25°C, 7 days at 2 - 8°C, 30 days at -20°C
Synonyms
FT4,T4,Thyroxine free
Turnaround Time
3 hours
Specimen Type
- Plasma
- Serum
Specimen Requirements
Tube/Container Type:
Preferred
- PPT Plasma Preparation Tube (Pale Pink Cap)
Acceptable
- EDTA (Lavender Cap)
- Lithium Heparin - Non-gel (Green Cap)
- Plain (Red Top)
- SST II (Gold Cap)
Paediatric Specimen Requirements
Tube/Container Type:
Preferred
- Heparin (Microtainer)
Acceptable
- EDTA (Microtainer)
- Plain(Microtainer)
- SST(Microtainer)
Additional Specimen Information
4.5 mL PST Blood (Preferred)
Micro-PST 0.5 mL Paediatric Micro-PST Blood (Preferred)
EDTA 4 mL EDTA Blood
Heparin 5 mL Heparin Blood
Plain 4 mL Plain Blood
SST 3.5 mL SST Blood
Microsample 0.5 mL Paediatric Microsample Blood
Micro-heparin 0.5 mL Paediatric Micro-heparin Blood
Micro-EDTA 0.5 mL Paediatric Micro-EDTA Blood
Last updated: 26/03/2026